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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings (Accumulated Deficit) | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 59,685,000 | 2,029,000 |  |  |  |
Beginning balance at Dec. 31, 2016 | $ 287,701 | $ 6 | $ (20,269) | $ 318,392 | $ (956) | $ (9,830) | $ 358
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss | (27,395) |  |  |  |  | (27,395) |
Foreign currency translation adjustment | 72 |  |  |  |  |  |
Stock issued under employee stock purchase plan (in shares) |  |  | (113,000) |  |  |  |
Stock issued under employee stock purchase plan | 654 |  |  | 654 |  |  |
Common stock issued in payment of accrued liability (in shares) |  | 0 |  |  |  |  |
Common stock issued in payment of accrued liability | 188 |  |  | 188 |  |  |
Stock options exercised (in shares) |  | 663,000 |  |  |  |  |
Stock options exercised | $ 5,884 | $ 0 |  | 5,884 |  |  |
Restricted stock awards granted (in shares) |  | 275,000 |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 122,000 |  |  |  |
Treasury stock purchased (in shares) | 238,216 |  | 200,000 |  |  |  |
Treasury stock purchased | $ (1,729) |  | $ (1,729) |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 3,225 |  | 478,000 |  |  |  |
Stock surrendered for exercise of stock options | $ (5,863) |  | $ (5,863) |  |  |  |
Stock compensation expense | 10,949 |  |  | 10,949 |  |  |
Repurchase of common stock (in shares) |  |  | 905,000 |  |  |  |
Repurchase of common stock | 5,203 |  | $ 5,203 |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 60,623,000 | 3,621,000 |  |  |  |
Ending balance at Dec. 31, 2017 | 265,258 | $ 6 | $ (33,064) | 336,067 | (884) | (37,225) | 358
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss | (70,698) |  |  |  |  | (70,340) | (358)
Foreign currency translation adjustment | (232) |  |  |  |  |  |
Stock issued under employee stock purchase plan (in shares) |  |  | (111,000) |  |  |  |
Stock issued under employee stock purchase plan | 341 |  |  | 341 |  |  |
Common stock issued in payment of accrued liability | $ 0 |  |  |  |  |  |
Restricted stock awards granted (in shares) | 1,539,889 | 1,540,000 |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 158,000 |  |  |  |
Treasury stock purchased (in shares) | 199,644 |  | 102,000 |  |  |  |
Treasury stock purchased | $ (173) |  | $ (173) |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 478,287 |  |  |  |  |  |
Stock compensation expense | $ 7,128 |  |  | 7,128 |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 62,163,000 | 3,770,000 |  |  |  |
Ending balance at Dec. 31, 2018 | $ 201,624 | $ 6 | $ (33,237) | 343,536 | (1,116) | (107,565) | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss | (32,279) |  |  |  |  | (32,279) |
Foreign currency translation adjustment | 150 |  |  |  | 150 |  |
Stock issued under employee stock purchase plan (in shares) |  |  | (18,000) |  |  |  |
Stock issued under employee stock purchase plan | 35 |  |  | 35 |  |  |
Common stock issued in payment of accrued liability | $ 0 |  |  |  |  |  |
Stock options exercised (in shares) | 0 |  |  |  |  |  |
Restricted stock awards granted (in shares) | 924,022 | 924,000 |  |  |  |  |
Restricted stock awards forfeited (in shares) |  |  | 299,000 |  |  |  |
Treasury stock purchased (in shares) | 93,977 |  | 94,000 |  |  |  |
Treasury stock purchased | $ (247) |  | $ (247) |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 0 |  |  |  |  |  |
Stock compensation expense | $ 3,993 |  |  | 3,993 |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  | 63,657,000 | 4,145,000 |  |  |  |
Ending balance at Dec. 31, 2019 | $ 173,276 | $ 6 | $ (33,484) | $ 347,564 | $ (966) | $ (139,844) | $ 0

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