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Condensed Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Impact of adoption | Preferred Stock | Common Stock | Additional Paid-In Capital | Treasury Stock | Retained Earnings / (Accumulated Deficit) | Retained Earnings / (Accumulated Deficit) Impact of adoption
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 11,210 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income / (loss) attributable to common stockholders | (236) |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 10,974 |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  |  | 0 | 48,701,000 |  | 0 |  |
Balance at Dec. 31, 2019 | 355,651 | $ (816) | $ 0 | $ 487 | $ 365,627 | $ 0 | $ (10,463) | $ (816)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued in connection with equity-based plans (in shares) |  |  |  | 107,000 |  |  |  |
Common stock issued in connection with equity-based plans | 1,365 |  |  | $ 1 | 1,364 |  |  |
Stock-based compensation expense | $ 6,358 |  |  |  | 6,358 |  |  |
Purchases of treasury stock (in shares) | 147,153 |  |  |  |  | 147,000 |  |
Purchases of treasury stock | $ (5,149) |  |  |  |  | $ (5,149) |  |
Net income / (loss) attributable to common stockholders | 8,807 |  |  |  |  |  | 8,807 |
Balance (in shares) at Mar. 31, 2020 |  |  | 0 | 48,808,000 |  | 147,000 |  |
Balance at Mar. 31, 2020 | 366,216 |  | $ 0 | $ 488 | 373,349 | $ (5,149) | (2,472) |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | 112 |  |  |  |  |  |  |
Net income / (loss) attributable to common stockholders | (370) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 10,716 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued in connection with equity-based plans (in shares) |  |  |  | 263,000 |  |  |  |
Common stock issued in connection with equity-based plans | 3,059 |  |  | $ 3 | 3,056 |  |  |
Stock-based compensation expense | $ 7,095 |  |  |  | 7,095 |  |  |
Purchases of treasury stock (in shares) | 0 |  |  |  |  |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | $ (112) |  |  |  | (112) |  |  |
Net income / (loss) attributable to common stockholders | 16,995 |  |  |  |  |  | 16,995 |
Balance (in shares) at Jun. 30, 2020 |  |  | 0 | 49,071,000 |  | 147,000 |  |
Balance at Jun. 30, 2020 | 393,253 |  | $ 0 | $ 491 | 383,388 | $ (5,149) | 14,523 |
Beginning balance at Dec. 31, 2020 | 10,691 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | 473 |  |  |  |  |  |  |
Net income / (loss) attributable to common stockholders | (280) |  |  |  |  |  |  |
Ending balance at Mar. 31, 2021 | 10,884 |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2020 |  |  | 0 | 49,631,000 |  | 147,000 |  |
Balance at Dec. 31, 2020 | 467,752 |  | $ 0 | $ 496 | 405,831 | $ (5,149) | 66,574 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued in connection with equity-based plans (in shares) |  |  |  | 173,000 |  |  |  |
Common stock issued in connection with equity-based plans | 1,989 |  |  | $ 2 | 1,987 |  |  |
Stock-based compensation expense | 7,888 |  |  |  | 7,888 |  |  |
Equity component of convertible senior notes, net | 56,515 |  |  |  | 56,515 |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | (473) |  |  |  | (473) |  |  |
Net income / (loss) attributable to common stockholders | 14,830 |  |  |  |  |  | 14,830 |
Balance (in shares) at Mar. 31, 2021 |  |  | 0 | 49,804,000 |  | 147,000 |  |
Balance at Mar. 31, 2021 | 548,501 |  | $ 0 | $ 498 | 471,748 | $ (5,149) | 81,404 |
Beginning balance at Dec. 31, 2020 | 10,691 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 11,372 |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2020 |  |  | 0 | 49,631,000 |  | 147,000 |  |
Balance at Dec. 31, 2020 | $ 467,752 |  | $ 0 | $ 496 | 405,831 | $ (5,149) | 66,574 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) | 0 |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  | 0 | 50,041,000 |  | 147,000 |  |
Balance at Jun. 30, 2021 | $ 573,437 |  | $ 0 | $ 500 | 481,937 | $ (5,149) | 96,149 |
Beginning balance at Mar. 31, 2021 | 10,884 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | 743 |  |  |  |  |  |  |
Net income / (loss) attributable to common stockholders | (255) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 11,372 |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2021 |  |  | 0 | 49,804,000 |  | 147,000 |  |
Balance at Mar. 31, 2021 | 548,501 |  | $ 0 | $ 498 | 471,748 | $ (5,149) | 81,404 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued in connection with equity-based plans (in shares) |  |  |  | 237,000 |  |  |  |
Common stock issued in connection with equity-based plans | 878 |  |  | $ 2 | 876 |  |  |
Stock-based compensation expense | $ 10,056 |  |  |  | 10,056 |  |  |
Purchases of treasury stock (in shares) | 0 |  |  |  |  |  |  |
Accretion adjustments of redeemable noncontrolling interest to redemption value | $ (743) |  |  |  | (743) |  |  |
Net income / (loss) attributable to common stockholders | 14,745 |  |  |  |  |  | 14,745 |
Balance (in shares) at Jun. 30, 2021 |  |  | 0 | 50,041,000 |  | 147,000 |  |
Balance at Jun. 30, 2021 | $ 573,437 |  | $ 0 | $ 500 | $ 481,937 | $ (5,149) | $ 96,149 |

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