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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Accumulated Deficit | Accumulated Other Comprehensive Income/(Loss) | Total
--- | --- | --- | --- | ---
Balances, beginning of period at Dec. 31, 2016 | $ 455,443 | $ (414,933) | $ 15 | $ 40,525
Balances, beginning of period (in shares) at Dec. 31, 2016 | 97,786,608 |  |  |
Shares issued (RSUs vested, net of shares withheld) | $ (264) |  |  | (264)
Shares issued (RSUs vested, net of shares withheld) (in shares) | 1,625,399 |  |  |
Stock-based compensation | $ 874 |  |  | 874
Other comprehensive loss |  |  | (17) | (17)
Net loss |  | (12,035) |  | (12,035)
Balances, end of period at Dec. 31, 2017 | $ 456,053 | (426,968) | (2) | 29,083
Balances, end of period (in shares) at Dec. 31, 2017 | 99,412,007 |  |  |
Cumulative adjustment related to Accounting Standard Update 2016-01 | Accounting Standards Update 2016-01 |  | (2) | $ 2 |
Cumulative adjustment balance | $ 456,053 | (426,970) |  | 29,083
Shares issued (RSUs vested, net of shares withheld) | $ (122) |  |  | (122)
Shares issued (RSUs vested, net of shares withheld) (in shares) | 637,554 |  |  |
Shares issued (exercise of stock options) | $ 86 |  |  | $ 86
Shares issued (exercise of stock options) (in shares) | 218,600 |  |  | 218,600
Stock-based compensation | $ 982 |  |  | $ 982
Option amendment (Note 6) | (61) |  |  | (61)
Net loss |  | (8,714) |  | (8,714)
Balances, end of period at Dec. 31, 2018 | $ 456,938 | $ (435,684) |  | $ 21,254
Balances, end of period (in shares) at Dec. 31, 2018 | 100,268,161 |  |  |

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