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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) | Total | Revision of Prior Period, Adjustment | Common Stock Issued | Common Stock Issued Revision of Prior Period, Adjustment | Additional Paid-in Capital | Additional Paid-in Capital Revision of Prior Period, Adjustment | Treasury Stock | Treasury Stock Revision of Prior Period, Adjustment | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance beginning of period (in shares) at Dec. 31, 2019 |  |  | 112,703,926 |  |  |  | 1,885,277 |  |
Balance, beginning of period at Dec. 31, 2019 | $ 34,398,000 |  | $ 113,000 |  | $ 147,231,000 |  | $ (10,806,000) |  | $ (102,140,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Share-based compensation expense | 3,781,000 |  |  |  | 3,781,000 |  |  |  |
Exercise of stock options | 298,000 |  |  |  | (1,658,000) |  | $ 1,956,000 |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | (220,300) |  |
Issuance of restricted stock | 0 |  |  |  | 0 |  | $ 0 |  |
Issuance of restricted stock (in shares) |  |  |  |  |  |  | 0 |  |
Restricted stock canceled/forfeited | 0 |  |  |  | 2,124,000 |  | $ (2,124,000) |  |
Restricted stock canceled/forfeited (in shares) |  |  |  |  |  |  | 285,611 |  |
Shares repurchased for tax withholding (in shares) |  |  |  |  |  |  | 461,934 |  |
Shares repurchased for tax withholding | (2,330,000) |  |  |  | 147,000 |  | $ (2,477,000) |  |
Net loss | (13,287,000) |  |  |  |  |  |  |  | (13,287,000)
Balance end of period (in shares) at Jun. 30, 2020 |  |  | 112,703,926 |  |  |  | 2,412,522 |  |
Balance, end of period at Jun. 30, 2020 | 22,860,000 |  | $ 113,000 |  | 151,625,000 |  | $ (13,451,000) |  | (115,427,000)
Balance beginning of period (in shares) at Mar. 31, 2020 |  |  | 112,703,926 |  |  |  | 2,163,066 |  |
Balance, beginning of period at Mar. 31, 2020 | 30,339,000 |  | $ 113,000 |  | 149,765,000 |  | $ (12,578,000) |  | (106,961,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Share-based compensation expense | 1,866,000 |  |  |  | 1,866,000 |  |  |  |
Exercise of stock options | 0 |  |  |  | (444,000) |  | $ 444,000 |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | (50,000) |  |
Restricted stock canceled/forfeited | 0 |  |  |  | 378,000 |  | $ (378,000) |  |
Restricted stock canceled/forfeited (in shares) |  |  |  |  |  |  | 42,613 |  |
Shares repurchased for tax withholding (in shares) |  |  |  |  |  |  | 256,843 |  |
Shares repurchased for tax withholding | (879,000) |  |  |  | 60,000 |  | $ (939,000) |  |
Net loss | (8,466,000) |  |  |  |  |  |  |  | (8,466,000)
Balance end of period (in shares) at Jun. 30, 2020 |  |  | 112,703,926 |  |  |  | 2,412,522 |  |
Balance, end of period at Jun. 30, 2020 | $ 22,860,000 |  | $ 113,000 |  | 151,625,000 |  | $ (13,451,000) |  | (115,427,000)
Balance beginning of period (in shares) at Dec. 31, 2020 | 112,703,926 |  | 112,703,926 |  |  |  | 1,773,683 |  |
Balance, beginning of period at Dec. 31, 2020 | $ (150,000) |  | $ 113,000 |  | 158,610,000 |  | $ (7,449,000) |  | (151,424,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Correction of out-of-period error (Note 1) | Stock Award Misstatements |  | $ 0 |  |  |  | $ (2,009,000) |  | $ 2,009,000 |
Correction of out-of-period error (Note 1) (in shares) | Stock Award Misstatements |  |  |  | 239,502 |  |  |  | (239,502) |
Deemed dividends | (926,000) |  |  |  | (926,000) |  |  |  |
Share-based compensation expense | 7,304,000 |  |  |  | 7,304,000 |  |  |  |
Exercise of stock options | $ 1,359,000 |  |  |  | (934,000) |  | $ 2,293,000 |  |
Exercise of stock options (in shares) | (494,139) |  |  |  |  |  | (452,329) |  |
Issuance of restricted stock | $ 0 |  |  |  | (3,576,000) |  | $ 3,576,000 |  |
Issuance of restricted stock (in shares) |  |  |  |  |  |  | (761,775) |  |
Restricted stock canceled/forfeited | 0 |  |  |  | 251,000 |  | $ (251,000) |  |
Restricted stock canceled/forfeited (in shares) |  |  |  |  |  |  | 48,026 |  |
Shares repurchased for tax withholding (in shares) |  |  |  |  |  |  | 453,885 |  |
Shares repurchased for tax withholding | (4,563,000) |  |  |  |  |  | $ (4,563,000) |  |
Net loss | $ (10,161,000) |  |  |  |  |  |  |  | (10,161,000)
Balance end of period (in shares) at Jun. 30, 2021 | 112,703,926 |  | 112,703,926 |  |  |  | 821,988 |  |
Balance, end of period at Jun. 30, 2021 | $ (7,137,000) |  | $ 113,000 |  | 158,720,000 |  | $ (4,385,000) |  | (161,585,000)
Balance beginning of period (in shares) at Mar. 31, 2021 |  |  | 112,703,926 |  |  |  | 1,083,297 |  |
Balance, beginning of period at Mar. 31, 2021 | (8,051,000) |  | $ 113,000 |  | 156,733,000 |  | $ (5,091,000) |  | (159,806,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Correction of out-of-period error (Note 1) | Stock Award Misstatements |  | $ 0 |  |  |  | $ (928,000) |  | $ 928,000 |
Correction of out-of-period error (Note 1) (in shares) | Stock Award Misstatements |  |  |  |  |  |  |  | (239,502) |
Deemed dividends | (464,000) |  |  |  | (464,000) |  |  |  |
Share-based compensation expense | 4,060,000 |  |  |  | 4,060,000 |  |  |  |
Exercise of stock options | 444,000 |  |  |  | (668,000) |  | $ 1,112,000 |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | (141,516) |  |
Issuance of restricted stock | 0 |  |  |  | (116,000) |  | $ 116,000 |  |
Issuance of restricted stock (in shares) |  |  |  |  |  |  | (19,774) |  |
Restricted stock canceled/forfeited | 0 |  |  |  | 103,000 |  | $ (103,000) |  |
Restricted stock canceled/forfeited (in shares) |  |  |  |  |  |  | 12,437 |  |
Shares repurchased for tax withholding (in shares) |  |  |  |  |  |  | 127,046 |  |
Shares repurchased for tax withholding | (1,347,000) |  |  |  |  |  | $ (1,347,000) |  |
Net loss | $ (1,779,000) |  |  |  |  |  |  |  | (1,779,000)
Balance end of period (in shares) at Jun. 30, 2021 | 112,703,926 |  | 112,703,926 |  |  |  | 821,988 |  |
Balance, end of period at Jun. 30, 2021 | $ (7,137,000) |  | $ 113,000 |  | $ 158,720,000 |  | $ (4,385,000) |  | $ (161,585,000)

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