v3.3.1.900

Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Common Stock. | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 7 | $ 5,483 | $ (71,786) | $ (66,296)
Balance (in shares) at Dec. 31, 2012 | 7,386,133 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Exercise of stock options | $ 1 | 324 |  | 325
Exercise of stock options (in shares) | 290,604 |  |  |
Accretion of issuance costs on redeemable convertible preferred stock |  | (347) |  | (347)
Stock-based compensation expense |  | 2,426 |  | 2,426
Repurchase of common shares |  | (69) | (110) | (179)
Repurchase of common shares (in shares) | (47,604) |  |  |
Net loss |  |  | (27,953) | (27,953)
Balance at Dec. 31, 2013 | $ 8 | 7,817 | (99,849) | (92,024)
Balance (in shares) at Dec. 31, 2013 | 7,629,133 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Exercise of stock options | $ 1 | 2,281 |  | 2,282
Exercise of stock options (in shares) | 940,642 |  |  |
Grant of common stock |  | 55 |  | 55
Grant in common stock (in shares) | 5,000 |  |  |
Accretion of issuance costs on redeemable convertible preferred stock |  | (89) |  | (89)
Stock-based compensation expense |  | 7,527 |  | 7,527
Conversion of redeemable convertible preferred stock to common stock | $ 23 | 98,113 |  | 98,136
Conversion of redeemable convertible preferred stock to common stock (in shares) | 23,501,208 |  |  |
Conversion of Series D warrants to common stock warrants |  | 821 |  | 821
Issuance of common stock, net of issuance costs | $ 9 | 100,293 |  | 100,302
Issuance of common stock, net of issuance costs ( in shares) | 8,626,377 |  |  |
Exercise of warrants to purchase common stock (in shares) | 32,709 |  |  |
Net loss |  |  | (28,999) | (28,999)
Balance at Dec. 31, 2014 | $ 41 | 216,818 | (128,848) | $ 88,011
Balance (in shares) at Dec. 31, 2014 | 40,735,069 |  |  | 40,735,069
Increase (Decrease) in Stockholders' Equity |  |  |  |
Exercise of stock options | $ 1 | 5,335 |  | $ 5,336
Exercise of stock options (in shares) | 1,141,731 |  |  |
Stock-based compensation expense |  | 11,749 |  | 11,749
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings |  | (436) |  | (436)
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings (in shares) | 248,088 |  |  |
Issuance of common stock, net of issuance costs | $ 4 | 117,108 |  | 117,112
Issuance of common stock, net of issuance costs ( in shares) | 3,625,000 |  |  |
Issuance of common stock award |  | 750 |  | 750
Issuance of common stock award (in shares) | 26,567 |  |  |
Net loss |  |  | (26,733) | (26,733)
Balance at Dec. 31, 2015 | $ 46 | $ 351,324 | $ (155,581) | $ 195,789
Balance (in shares) at Dec. 31, 2015 | 45,776,455 |  |  | 45,776,455

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