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Debt - Additional Information (Details) - USD ($)	1 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2014	Jul. 31, 2014	Aug. 31, 2013	Jun. 30, 2012	May. 31, 2012	Apr. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011	Jan. 31, 2011	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Apr. 30, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Unamortized debt issuance and term fee with penalty				$ 1,400,000
Amount of interest capitalized to property and equipment													$ 400,000	$ 311,000	$ 284,000
Hercules 2010 Agreement
Debt Instrument [Line Items]
Line of credit facility maturity date												Dec. 31, 2014
Interest percentage rate												8.50%
Percentage of term payment												5.00%
Principal payments															968,000	$ 577,000
Hercules 2010 Agreement | Equipment Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity												$ 3,000,000
Hercules 2010 Agreement | Growth Capital Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity												7,000,000
Hercules 2010 Agreement | Borrowings
Debt Instrument [Line Items]
Loan borrowings												$ 1,600,000
Hercules 2010 Agreement | Wall Street Journal [Member]
Debt Instrument [Line Items]
Prime variable interest percentage rate												5.25%
Hercules 2010 Agreement | Series C Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Issued warrants												199,219
Hercules 2010 Agreement | Series D Redeemable Convertible Preferred Stock [Member]
Debt Instrument [Line Items]
Issued warrants											158,133
Redeemable convertible preferred stock, purchase price per share											$ 3.1619
Hercules 2011 Agreement
Debt Instrument [Line Items]
Line of credit facility maturity date								Mar. 01, 2016
Line of credit facility, maximum borrowing capacity								$ 10,000,000
Prime variable interest percentage rate								7.50%
Percentage of term payment								2.50%
Principal payments															10,000,000	0
Issued warrants								62,255
Hercules 2011 Agreement | Borrowings
Debt Instrument [Line Items]
Loan borrowings							$ 353,000		$ 4,800,000	$ 4,800,000
Hercules 2011 Agreement | Wall Street Journal [Member]
Debt Instrument [Line Items]
Prime variable interest percentage rate								7.50%
Hercules 2011 Agreement | Wall Street Journal Minus
Debt Instrument [Line Items]
Prime variable interest percentage rate								3.75%
Hercules 2011 Agreement | Series D-1 Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Issued warrants										124,511
Redeemable convertible preferred stock, purchase price per share										$ 8.0314
Hercules 2012 Agreement
Debt Instrument [Line Items]
Line of credit facility maturity date					Jul. 01, 2016
Prime variable interest percentage rate					8.875%
Interest percentage rate								8.375%
Percentage of term payment					4.50%
Principal payments															20,000,000	0
Hercules 2012 Agreement | Growth Capital Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 20,000,000
Hercules 2012 Agreement | Borrowings
Debt Instrument [Line Items]
Loan borrowings					$ 10,000,000	$ 5,000,000		$ 5,000,000
Hercules 2012 Agreement | Wall Street Journal [Member]
Debt Instrument [Line Items]
Prime variable interest percentage rate					8.875%
Hercules 2012 Agreement | Wall Street Journal Minus
Debt Instrument [Line Items]
Prime variable interest percentage rate					3.75%
Hercules 2012 Agreement | Series D-2 Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Redeemable convertible preferred stock, purchase price per share								$ 9.0657
Issuance of Stock (in shares)								220,751
Hercules Technology Growth Capital Incorporation
Debt Instrument [Line Items]
Interest expense															3,000,000	1,900,000
Amount of interest capitalized to property and equipment															200,000	$ 585,000
August Two Thousand Thirteen Facility | Letter Of Credit
Debt Instrument [Line Items]
Interest percentage rate		3.25%
Line of credit facility, amount drawn		$ 25,000,000																$ 25,000,000
August Two Thousand Thirteen Facility | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maturity date		Aug. 31, 2016
Line of credit facility, maximum borrowing capacity		$ 75,000,000		$ 100,000,000													$ 60,000,000
Interest percentage rate			3.30%	3.40%
Interest expense													1,900,000	2,500,000	946,000
Amount of interest capitalized to property and equipment													$ 400,000	311,000	$ 84,000
Line of credit facility, term				2 years
Line of credit facility, unused commitment fee percentage				0.50%
Line of credit facility, amount drawn			$ 12,000,000	$ 34,000,000
Line of credit facility, amount paid down		$ 6,000,000
Line of credit facility														40,000,000
Line of credit facility, remaining borrowing capacity														$ 10,000,000
Repayments of outstanding principal balance	$ 40,000,000
August Two Thousand Thirteen Facility | London Interbank Offer Rate (LIBOR) | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				3.00%
August Two Thousand Thirteen Facility | Alternate Base Rate (ABR) | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, floating interest rate				2.00%
December Two Thousand Fifteen Facility | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maturity date	Dec. 31, 2017
Line of credit facility, maximum borrowing capacity	$ 40,000,000
Interest percentage rate	1.82%
Line of credit facility, amount drawn	$ 40,000,000
Debt instrument, description of variable rate basis													The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%.
Line of credit facility, commitment fee percentage	0.20%
December Two Thousand Fifteen Facility | Secured Debt | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Certificate of deposit held as collateral for letter of credit	$ 0
Minimum deposit amount with lender	$ 40,000,000
December Two Thousand Fifteen Facility | London Interbank Offer Rate (LIBOR) | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	1.25%
December Two Thousand Fifteen Facility | London Interbank Offer Rate (LIBOR) | Secured Debt | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	1.25%
December Two Thousand Fifteen Facility | London Interbank Offer Rate (LIBOR) | Secured Debt | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	3.75%
December Two Thousand Fifteen Facility | Prime Rate | Secured Debt | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	0.25%
December Two Thousand Fifteen Facility | Prime Rate | Secured Debt | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, floating interest rate	2.75%

X

- Definition

Amount of the total principal payments made during the annual reporting period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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This is the amount of cash advanced as security in return for borrowing securities from another party.

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Amount of interest capitalized during the period.

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Aggregate amount of interest expense on all borrowings.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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