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CONSOLIDATED STATEMENT OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Common Stock IPO | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2014 |  |  | $ 27,997 |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2014 |  |  | 66,330 | 10,166 | [1] |  |  |
Balance at beginning of period at Dec. 31, 2014 |  | $ (6,131) |  |  |  |  | $ 488 | $ (6,619)
Modification to Series B participation rights |  |  | $ (3,793) |  |  |  |  |
Modification to Series B participation rights |  | 3,793 |  |  |  |  |  | 3,793
Exercise of common stock options (in shares) | [1] |  |  | 711 |  |  |  |
Exercise of common stock options |  | 166 |  |  |  |  | 166 |
Issuance of common stock to employee (in shares) | [1] |  |  | 7 |  |  |  |
Stock-based compensation |  | 385 |  |  |  |  | 385 |
Net income |  | 15,929 |  |  |  |  |  | 15,929
Balance at end of period at Dec. 31, 2015 |  |  | $ 24,204 |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2015 |  |  | 66,330 | 10,884 | [1] |  |  |
Balance at end of period at Dec. 31, 2015 |  | 14,142 |  |  |  |  | 1,039 | 13,103
Exercise of common stock options (in shares) | [1] |  |  | 785 |  |  |  |
Exercise of common stock options |  | 488 |  |  |  |  | 488 |
Issuance of series C convertible preferred stock, net of issuance costs |  |  | $ 59,871 |  |  |  |  |
Issuance of series C convertible preferred stock, net of issuance costs (in shares) |  |  | 11,501 |  |  |  |  |
Reclassification of preferred stock warrant liability upon net exercise of warrant |  |  | $ 3,789 |  |  |  |  |
Repurchase of convertible preferred stock |  | (47,209) | $ (4,623) |  |  |  | (1,168) | (46,041)
Repurchase of convertible preferred stock (in shares) |  |  | (12,384) |  |  |  |  |
Repurchase and retirement of common stock |  | (2,362) |  |  |  |  |  | (2,362)
Repurchase and retirement of common stock (in shares) | [1] |  |  | (189) |  |  |  |
Issuance of common stock to employee |  | 73,634 |  |  |  |  | 73,634 |
Issuance of common stock to employee (in shares) | [1] |  |  |  |  | 4,667 |  |
Stock-based compensation |  | 5,144 |  |  |  |  | 5,144 |
Conversion of convertible preferred stock to Class B common stock in connection with IPO |  | 83,241 |  |  |  |  | 83,241 |
Conversion of convertible preferred stock to Class B common stock in connection with IPO (in shares) |  |  | (66,236) | 22,079 | [1] |  |  |
Conversion of warrant for convertible preferred stock to a warrant for Class B common stock in connection with IPO |  | 12,596 |  |  |  |  | 12,596 |
Issuance of common stock under employee stock purchase plan |  | 4,224 |  |  |  |  | 4,224 |
Issuance of common stock under employee stock purchase plan (in shares) | [1] |  |  | 276 |  |  |  |
Grants of restricted stock (in shares) | [1] |  |  | 180 |  |  |  |
Net income |  | 20,482 |  |  |  |  |  | 20,482
Balance at end of period (in shares) at Dec. 31, 2016 | [1] |  |  | 39,131 |  |  |  |
Balance at end of period at Dec. 31, 2016 |  | 164,380 |  |  |  |  | 179,198 | (14,818)
Reclassification of preferred stock warrant liability upon net exercise of warrant (in shares) |  |  | 789 |  |  |  |  |
Conversion of convertible preferred stock to Class B common stock in connection with IPO |  |  | $ (83,241) |  |  |  |  |
Net exercise of warrant to purchase Class B common stock (in shares) | [1] |  |  | 449 |  |  |  |
Exercise of common stock options (in shares) | [1] |  |  | 1,932 |  |  |  |
Exercise of common stock options |  | 2,565 |  |  |  |  | 2,565 |
Stock-based compensation |  | 21,860 |  |  |  |  | 21,860 |
Issuance of common stock under employee stock purchase plan |  | 6,997 |  |  |  |  | 6,997 |
Issuance of common stock under employee stock purchase plan (in shares) | [1] |  |  | 433 |  |  |  |
Restricted stock, net of forfeitures and shares withheld for taxes |  | (1,017) |  |  |  |  | (1,017) |
Restricted stock, net of forfeitures and shares withheld for taxes (in shares) | [1] |  |  | 145 |  |  |  |
Net income |  | 50,798 |  |  |  |  |  | 50,798
Balance at end of period (in shares) at Dec. 31, 2017 | [1] |  |  | 41,641 |  |  |  |
Balance at end of period at Dec. 31, 2017 |  | $ 245,583 |  |  |  |  | $ 209,603 | $ 35,980
[1] | See Note 9-Capitalization for discussion of the establishment of the Company’s two classes of common stock and the reclassification of its common stock into Class B common stock prior to the Company’s initial public offering (“IPO”) in September 2016.

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