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Stockholder's Equity - Summary of Common Stock Shares Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Beginning balance | $ 12,895 | $ 31,225
Beginning balance (in shares) | 97,413,721 |
Net loss | $ (7,002) | (22,908)
Stock-based compensation expense | 410 | 492
Common stock issued through employee stock purchase plan | 18 | 20
Common stock issued, net of expenses | $ 207 | 2,509
Common stock issued for exercise of stock options (in shares) | 0 |
Common stock issued for vested restricted stock units | $ (73) | (8)
Ending balance | $ 6,455 | 11,330
Ending balance (in shares) | 97,876,042 |
Common Stock |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Beginning balance | $ 97 | $ 48
Beginning balance (in shares) | 97,413,721 | 47,971,989
Net loss | $ 0 | $ 0
Stock-based compensation expense | 0 | 0
Common stock issued through employee stock purchase plan | $ 0 | $ 0
Common stock issued through employee stock purchase plan (in shares) | 22,143 | 19,259
Common stock issued, net of expenses | $ 1 | $ 2
Common stock issued, net of expenses (in shares) | 285,276 | 2,226,569
Common stock issued for vested restricted stock units | $ 0 | $ 0
Common stock issued for vested restricted stock units (in shares) | 154,902 | 14,612
Ending balance | $ 98 | $ 50
Ending balance (in shares) | 97,876,042 | 50,232,429
Additional Paid-in Capital |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Beginning balance | $ 284,226 | $ 248,895
Net loss | 0 | 0
Stock-based compensation expense | 410 | 492
Common stock issued through employee stock purchase plan | 18 | 20
Common stock issued, net of expenses | 206 | 2,507
Common stock issued for vested restricted stock units | (73) | (8)
Ending balance | 284,787 | 251,906
Accumulated Deficit |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Beginning balance | (271,428) | (217,718)
Net loss | (7,002) | (22,908)
Stock-based compensation expense | 0 | 0
Common stock issued through employee stock purchase plan | 0 | 0
Common stock issued, net of expenses | 0 | 0
Common stock issued for vested restricted stock units | 0 | 0
Ending balance | $ (278,430) | $ (240,626)

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