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Consolidated Statements of Convertible Preferred Stock and Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Series One-Three convertible preferred stock | Series Four convertible preferred stock | Series Five convertible preferred stock | Common stock | Additional paid-in capital | Accumulated other comprehensive income (loss) | Accumulated deficit | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2012 | $ 80,824 |  |  |  |  |  |  |
Balance, beginning of period (in shares) at Dec. 31, 2012 | 15,038,259 |  |  |  |  |  |  |
Increase (decrease) in temporary equity |  |  |  |  |  |  |  |
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock | $ (80,824) | $ 60,785 | $ 101,682 |  |  |  |  |
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock (in shares) | (15,038,259) | 5,374,954 | 8,796,002 |  |  |  |  |
Conversion of series of convertible preferred stock to common stock |  | $ (60,785) | $ (101,682) |  |  |  |  |
Conversion of series of convertible preferred stock to common stock (in shares) |  | (5,374,954) | (8,796,002) |  |  |  |  |
Balance at Dec. 31, 2012 |  |  |  |  | $ 177,584 |  | $ (277,224) | $ (99,640)
Balance (in shares) at Dec. 31, 2012 |  |  |  | 545,345 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Reverse stock split |  |  |  | (540,819) |  |  |  |
Issuance and exchange of series of convertible preferred stock for series of convertible preferred stock |  |  |  |  | (14,858) |  |  | (14,858)
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs |  |  |  | $ 10 | 131,640 |  |  | 131,650
Issuance of common stock from IPO and exercise of over allotment exercise, net of offering costs (in shares) |  |  |  | 9,627,800 |  |  |  |
Conversion of series of convertible preferred stock to common stock |  |  |  | $ 14 | 162,453 |  |  | 162,467
Conversion of series of convertible preferred stock to common stock (in shares) |  |  |  | 14,170,956 |  |  |  |
Share-based compensation expense |  |  |  |  | 8,427 |  |  | 8,427
Net loss |  |  |  |  |  |  | (51,574) | (51,574)
Comprehensive income (loss) |  |  |  |  |  | $ 70 |  | 70
Balance at Dec. 31, 2013 |  |  |  | $ 24 | 465,246 | 70 | (328,798) | 136,542
Balance (in shares) at Dec. 31, 2013 |  |  |  | 23,803,282 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Issuance of common stock from public offerings and exercise of over allotment exercise, net of offering costs |  |  |  | $ 9 | 235,971 |  |  | 235,980
Issuance of common stock from public offerings and exercise of over allotment exercise, net of offering costs (in shares) |  |  |  | 8,613,265 |  |  |  |
Exercise of stock options |  |  |  |  | 1,195 |  |  | 1,195
Exercise of stock options (in shares) |  |  |  | 108,645 |  |  |  |
Restricted stock vesting (in shares) |  |  |  | 373,200 |  |  |  |
Share-based compensation expense |  |  |  |  | 19,310 |  |  | 19,310
Net loss |  |  |  |  |  |  | (93,753) | (93,753)
Comprehensive income (loss) |  |  |  |  |  | (807) |  | (807)
Balance at Dec. 31, 2014 |  |  |  | $ 33 | 721,722 | (737) | (422,551) | 298,467
Balance (in shares) at Dec. 31, 2014 |  |  |  | 32,898,392 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Equity component of the convertible notes issuance, net |  |  |  |  | 57,538 |  |  | 57,538
Debt Issuance Cost |  |  |  |  | (1,784) |  |  | (1,784)
Exercise of stock options |  |  |  | $ 1 | 8,710 |  |  | 8,711
Exercise of stock options (in shares) |  |  |  | 656,248 |  |  |  |
Restricted stock vesting (in shares) |  |  |  | 361,919 |  |  |  |
Share-based compensation expense |  |  |  |  | 33,979 |  |  | 33,979
Net loss |  |  |  |  |  |  | (170,447) | (170,447)
Comprehensive income (loss) |  |  |  |  |  | (463) |  | (463)
Balance at Dec. 31, 2015 |  |  |  | $ 34 | $ 820,165 | $ (1,200) | $ (592,998) | $ 226,001
Balance (in shares) at Dec. 31, 2015 |  |  |  | 33,916,559 |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition Redemption of temporary equity as the result of a triggering event associated with the temporary equity. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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