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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Balances (in shares) at Dec. 31, 2017 |  | 40,669,000 |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 279,483 | $ 41 | $ 669,032 | $ (389,136) | $ (454)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Exercise of stock options (in shares) |  | 103,000 |  |  |
Exercise of stock options | 1,492 | $ 0 | 1,492 |  |
Vested restricted stock units (in shares) |  | 148,000 |  |  |
Vested restricted stock units | $ 0 | $ 0 |  |  |
Shares issued under employee stock purchase plan (shares) | 34,985 | 35,000 |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 952 |  | 952 |  |
Stock-based compensation | 15,432 |  | 15,432 |  |
Net unrealized gain (loss) on investments | (91) |  |  |  | (91)
Net loss | (8,116) |  |  | (8,116) |
Balances (in shares) at Jun. 30, 2018 |  | 40,955,000 |  |  |
Balance at end of period at Jun. 30, 2018 | 290,513 | $ 41 | 686,888 | (395,871) | (545)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 2) | 1,361 |  |  | 1,361 |
Net unrealized gain (loss) on investments | 356 |  |  |  |
Net loss | 2,564 |  |  |  |
Balances (in shares) at Jun. 30, 2018 |  | 40,955,000 |  |  |
Balance at end of period at Jun. 30, 2018 | $ 290,513 | $ 41 | 686,888 | (395,871) | $ (545)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 2) |  |  | $ (20) | $ 20 |

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