Notes Payable	9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]
Notes Payable	4. Notes Payable 2013 Promissory Note—In June 2013, the Company entered into a Securities Purchase Agreement (the 2013 Securities Purchase Agreement) whereby the Company issued to an institutional investor a $1,000 note payable (the 2013 Promissory Note) plus 1,851 shares of Series B preferred stock for aggregate proceeds of $1,000. The 2013 Promissory Note accrued interest at 5% per annum and was scheduled to mature on June 20, 2014. The 2013 Promissory Note was secured by all of the assets of the Company. The Company allocated the proceeds under the 2013 Securities Purchase Agreement to the 2013 Promissory Note and Series B preferred stock based on their relative fair values, which resulted in $364 and $636 being allocated to the 2013 Promissory Note and Series B preferred stock, respectively. The Company recorded a debt discount of $636, which was being amortized to interest expense over the term of the 2013 Promissory Note using the effective interest method. In April 2014, the Company entered into the 2014 Securities Purchase Agreement at which time the holder of the 2013 Promissory Note agreed to convert the $1,000 principal into 771,458 shares of Series C preferred stock plus a warrant to purchase 192,865 shares of Class A common stock having the same terms as the warrants issued in the 2014 Securities Purchase Agreement. The Company paid accrued interest of $39 in cash. Other Notes and Payables—The 2013 Securities Purchase Agreement was a qualified financing. As a result, certain holders of notes payable and accounts payable totaling $950 (Converting Creditors) converted their outstanding payable balances into Class A common stock at a conversion price of $2.44 per share. The Series A preferred stock holders and Converting Creditors also entered into a shareholder lock up agreement. 2009 Convertible Notes—In 2009, the Company executed a Bridge Loan Agreement to sell and issue $426 of convertible promissory notes (the 2009 Convertible Notes). The 2009 Convertible Notes accrued interest at 15% per annum until maturity on September 30, 2010 (the Maturity Date). After the Maturity Date, the 2009 Convertible Notes accrued interest at 24% per annum. The 2009 Convertible Notes were convertible at the option of the holders into securities issued in the Company’s next financing. The 2009 Convertible Notes were secured by all of the Company’s assets. At December 31, 2013, there was $426 of principal and $396 of accrued interest outstanding on the 2009 Convertible Notes. As discussed below, the 2009 Convertible Notes were exchanged for shares of Class A common stock, and there was no balance outstanding on the 2009 Convertible Notes at December 31, 2014. Each holder of the 2009 Convertible Notes also received a warrant to purchase shares of Class A common stock (2009 Warrants). The 2009 Warrants are exercisable only if and to the extent that the holder subscribed to the next financing for a number of shares equal to 300% of the number of shares issued to the holder in the next financing. The exercise price of the 2009 Warrants initially is the purchase price for the shares in the next financing. However, for up to two years after the date that the Company becomes a public company, the exercise price is adjusted to a price equal to the price of the new equity securities should the Company enter into any new equity transaction whereby the price of the equity in the new transaction is lower than the exercise price of the 2009 Warrants. In conjunction with the 2013 Securities Purchase Agreement, each holder of the 2009 Convertible Notes entered into a consent, amendment and exchange agreement (the Exchange Agreement). The Exchange Agreement (i) modified the Maturity Date to June 20, 2014; (ii) caused each holder to execute a subordination and shareholder lock-up agreement, and; (iii) upon a Mandatory Exchange Financing, automatically exchanged the outstanding principal and accrued interest under the 2009 Convertible Notes and the 2009 Warrants for shares of Class A common stock at an exchange rate of three times the principal amount of the 2009 Convertible Notes divided by the per share price of the Mandatory Exchange Financing. In April 2014, the 2014 Securities Purchase Agreement qualified as a Mandatory Exchange Financing and the $426 principal balance plus $422 accrued interest on the 2009 Convertible Notes and the 2009 Warrants were exchanged for 985,229 shares of the Company’s Class A common stock. In connection with the sale of the 2009 Convertible Notes, the Company used a placement agent. The placement agent received a corporate advisory warrant (the CA Warrant) for common stock equal to 20% of the issued and outstanding common stock of the Company on a fully diluted basis immediately following the final closing of the bridge financing. The CA Warrant had an exercise price of $2.44 per share and was to expire on September 30, 2019. The placement agent also received a warrant for common stock for the number of shares equal to 9% of the number of warrant shares issued to the holders who subscribe to the next financing (the PA Warrant). The initial exercise price of the PA Warrant is equal to the price of the next financing. In conjunction with the 2013 Securities Purchase Agreement, the placement agent agreed to exchange the CA Warrant and PA Warrant into shares of Class A common stock equal to 10% of the shares of fully-diluted stock outstanding immediately following the closing of a Mandatory Exchange Financing less certain exempted issuances. At the 2014 Securities Purchase Agreement closing, the CA Warrant and PA Warrant were exchanged for 3,052,608 shares of the Company’s Class A common stock. The Company also issued to the placement agent 34,715 shares of Class A common stock in exchange for a cash commission. Settlement Agreement—In 2007, the Company entered into a settlement agreement with a former officer of the Company (the Settlement Agreement). The Settlement Agreement included a cash payment to the former officer of $265 payable upon the Company’s receipt of any debt or equity financing. As part of the 2009 Convertible Notes financing, the Settlement Agreement was amended so that the $265 will convert into Class A common stock at a conversion price of $2.44 per share on the second anniversary of Company being a publicly traded company. In March 2015, the Company entered into a Supplemental Agreement and General Release (the Supplemental Agreement) with the former officer related to the Settlement Agreement. As a result, (i) the Company agreed to pay $132 in exchange for retiring the note and (ii) the former officer agreed to exercise a warrant to purchase 32,675 shares of Class A common stock at an exercise price of $2.44 per share. The $133 difference between the carrying value of the note payable and the amount paid to retire the note is reflected in other income on the condensed consolidated statement of operations. Founder Note—As of December 31, 2013, the Company owed a founder of the Company $23 associated with a license agreement and miscellaneous other obligations. In April 2014, the outstanding balance was paid in full. Other Notes and Creditors—As part of the 2009 Convertible Notes financing, certain other note holders and creditors with obligations totaling $194 (Other Creditors) executed agreements either to defer payment for three years or convert the obligations into Class A common stock upon the Company closing a financing of at least $1,200 at a conversion price of $2.44 per share. In conjunction with the 2013 Securities Purchase Agreement, Other Creditors holding $20 of principal plus $29 of accrued interest elected to convert their obligations into 20,205 shares of Class A common stock. Other Creditors holding $50 of principal entered into exchange agreements whereby, upon the Company completing a Mandatory Exchange Financing, the balance plus any accrued interest is automatically exchanged for shares of Class A common stock at an exchange rate of three times the amount owed divided by the per share price of the Mandatory Exchange Financing. At the close of the 2014 Securities Purchase Agreement, the $50 principal plus accrued interest of $50 were exchanged for 230,859 shares of Class A common stock. In April 2014, an Other Creditor with $95 of outstanding principal and interest agreed to sell its note to a third party who agreed to exchange the note for 114,369 shares of Class A common stock. Other Creditors with $29 of outstanding principal plus $13 of accrued interest were repaid in cash in April 2014. Side Agreement Notes—Payables and debt totaling $249 were sold by certain creditors to existing investors (the Side Agreements). In conjunction with the Side Agreements, the Company issued to the investors convertible notes pursuant to an exchange agreement whereby upon the Company completing a Mandatory Exchange Financing, the outstanding balance under the convertible notes are automatically exchanged for shares of Class A common stock at an exchange rate of the amount divided by the per share price of the Mandatory Exchange Financing (the Side Agreement Notes). At the close of the 2014 Securities Purchase Agreement, the $249 balance of the convertible notes was exchanged for 192,341 shares of Class A common stock.

4. Notes Payable

2013 Promissory Note—In June 2013, the Company entered into a Securities Purchase Agreement (the 2013 Securities Purchase Agreement) whereby the Company issued to an institutional investor a $1,000 note payable (the 2013 Promissory Note) plus 1,851 shares of Series B preferred stock for aggregate proceeds of $1,000. The 2013 Promissory Note accrued interest at 5% per annum and was scheduled to mature on June 20, 2014. The 2013 Promissory Note was secured by all of the assets of the Company.

The Company allocated the proceeds under the 2013 Securities Purchase Agreement to the 2013 Promissory Note and Series B preferred stock based on their relative fair values, which resulted in $364 and $636 being allocated to the 2013 Promissory Note and Series B preferred stock, respectively. The Company recorded a debt discount of $636, which was being amortized to interest expense over the term of the 2013 Promissory Note using the effective interest method.

In April 2014, the Company entered into the 2014 Securities Purchase Agreement at which time the holder of the 2013 Promissory Note agreed to convert the $1,000 principal into 771,458 shares of Series C preferred stock plus a warrant to purchase 192,865 shares of Class A common stock having the same terms as the warrants issued in the 2014 Securities Purchase Agreement. The Company paid accrued interest of $39 in cash.

Other Notes and Payables—The 2013 Securities Purchase Agreement was a qualified financing. As a result, certain holders of notes payable and accounts payable totaling $950 (Converting Creditors) converted their outstanding payable balances into Class A common stock at a conversion price of $2.44 per share. The Series A preferred stock holders and Converting Creditors also entered into a shareholder lock up agreement.

2009 Convertible Notes—In 2009, the Company executed a Bridge Loan Agreement to sell and issue $426 of convertible promissory notes (the 2009 Convertible Notes). The 2009 Convertible Notes accrued interest at 15% per annum until maturity on September 30, 2010 (the Maturity Date). After the Maturity Date, the 2009 Convertible Notes accrued interest at 24% per annum. The 2009 Convertible Notes were convertible at the option of the holders into securities issued in the Company’s next financing. The 2009 Convertible Notes were secured by all of the Company’s assets. At December 31, 2013, there was $426 of principal and $396 of accrued interest outstanding on the 2009 Convertible Notes. As discussed below, the 2009 Convertible Notes were exchanged for shares of Class A common stock, and there was no balance outstanding on the 2009 Convertible Notes at December 31, 2014.

Each holder of the 2009 Convertible Notes also received a warrant to purchase shares of Class A common stock (2009 Warrants). The 2009 Warrants are exercisable only if and to the extent that the holder subscribed to the next financing for a number of shares equal to 300% of the number of shares issued to the holder in the next financing.

The exercise price of the 2009 Warrants initially is the purchase price for the shares in the next financing. However, for up to two years after the date that the Company becomes a public company, the exercise price is adjusted to a price equal to the price of the new equity securities should the Company enter into any new equity transaction whereby the price of the equity in the new transaction is lower than the exercise price of the 2009 Warrants.

In conjunction with the 2013 Securities Purchase Agreement, each holder of the 2009 Convertible Notes entered into a consent, amendment and exchange agreement (the Exchange Agreement). The Exchange Agreement (i) modified the Maturity Date to June 20, 2014; (ii) caused each holder to execute a subordination and shareholder lock-up agreement, and; (iii) upon a Mandatory Exchange Financing, automatically exchanged the outstanding principal and accrued interest under the 2009 Convertible Notes and the 2009 Warrants for shares of Class A common stock at an exchange rate of three times the principal amount of the 2009 Convertible Notes divided by the per share price of the Mandatory Exchange Financing. In April 2014, the 2014 Securities Purchase Agreement qualified as a Mandatory Exchange Financing and the $426 principal balance plus $422 accrued interest on the 2009 Convertible Notes and the 2009 Warrants were exchanged for 985,229 shares of the Company’s Class A common stock.

In connection with the sale of the 2009 Convertible Notes, the Company used a placement agent. The placement agent received a corporate advisory warrant (the CA Warrant) for common stock equal to 20% of the issued and outstanding common stock of the Company on a fully diluted basis immediately following the final closing of the bridge financing. The CA Warrant had an exercise price of $2.44 per share and was to expire on September 30, 2019. The placement agent also received a warrant for common stock for the number of shares equal to 9% of the number of warrant shares issued to the holders who subscribe to the next financing (the PA Warrant). The initial exercise price of the PA Warrant is equal to the price of the next financing.

In conjunction with the 2013 Securities Purchase Agreement, the placement agent agreed to exchange the CA Warrant and PA Warrant into shares of Class A common stock equal to 10% of the shares of fully-diluted stock outstanding immediately following the closing of a Mandatory Exchange Financing less certain exempted issuances.

At the 2014 Securities Purchase Agreement closing, the CA Warrant and PA Warrant were exchanged for 3,052,608 shares of the Company’s Class A common stock.

The Company also issued to the placement agent 34,715 shares of Class A common stock in exchange for a cash commission.

Settlement Agreement—In 2007, the Company entered into a settlement agreement with a former officer of the Company (the Settlement Agreement). The Settlement Agreement included a cash payment to the former officer of $265 payable upon the Company’s receipt of any debt or equity financing. As part of the 2009 Convertible Notes financing, the Settlement Agreement was amended so that the $265 will convert into Class A common stock at a conversion price of $2.44 per share on the second anniversary of Company being a publicly traded company. In March 2015, the Company entered into a Supplemental Agreement and General Release (the Supplemental Agreement) with the former officer related to the Settlement Agreement. As a result, (i) the Company agreed to pay $132 in exchange for retiring the note and (ii) the former officer agreed to exercise a warrant to purchase 32,675 shares of Class A common stock at an exercise price of $2.44 per share. The $133 difference between the carrying value of the note payable and the amount paid to retire the note is reflected in other income on the condensed consolidated statement of operations.

Founder Note—As of December 31, 2013, the Company owed a founder of the Company $23 associated with a license agreement and miscellaneous other obligations. In April 2014, the outstanding balance was paid in full.

Other Notes and Creditors—As part of the 2009 Convertible Notes financing, certain other note holders and creditors with obligations totaling $194 (Other Creditors) executed agreements either to defer payment for three years or convert the obligations into Class A common stock upon the Company closing a financing of at least $1,200 at a conversion price of $2.44 per share. In conjunction with the 2013 Securities Purchase Agreement, Other Creditors holding $20 of principal plus $29 of accrued interest elected to convert their obligations into 20,205 shares of Class A common stock.

Other Creditors holding $50 of principal entered into exchange agreements whereby, upon the Company completing a Mandatory Exchange Financing, the balance plus any accrued interest is automatically exchanged for shares of Class A common stock at an exchange rate of three times the amount owed divided by the per share price of the Mandatory Exchange Financing. At the close of the 2014 Securities Purchase Agreement, the $50 principal plus accrued interest of $50 were exchanged for 230,859 shares of Class A common stock. In April 2014, an Other Creditor with $95 of outstanding principal and interest agreed to sell its note to a third party who agreed to exchange the note for 114,369 shares of Class A common stock. Other Creditors with $29 of outstanding principal plus $13 of accrued interest were repaid in cash in April 2014.

Side Agreement Notes—Payables and debt totaling $249 were sold by certain creditors to existing investors (the Side Agreements). In conjunction with the Side Agreements, the Company issued to the investors convertible notes pursuant to an exchange agreement whereby upon the Company completing a Mandatory Exchange Financing, the outstanding balance under the convertible notes are automatically exchanged for shares of Class A common stock at an exchange rate of the amount divided by the per share price of the Mandatory Exchange Financing (the Side Agreement Notes). At the close of the 2014 Securities Purchase Agreement, the $249 balance of the convertible notes was exchanged for 192,341 shares of Class A common stock.