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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings (Deficit) | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2017 |  | 223,289 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 1,115,901 | $ 2,814 | $ 1,050,873 | $ 106,923 | $ (30,972) | $ (13,737)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (42,073) |  |  | (42,073) |  |
Foreign currency translation adjustments | 87 |  |  |  | 87 |
Change in marketable securities/ reclassification of marketable securities | (85) |  |  |  | (85) |
Equity-based compensation expense | 2,280 |  | 2,280 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 601 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 8 | (8) |  |  |
Common shares issued for employee stock purchase plan (in shares) |  | 99 |  |  |  |
Common shares issued for employee stock purchase plan | 561 | $ 1 | 560 |  |  |
Treasury shares withheld (in shares) |  | (167) |  |  |  |
Treasury shares withheld | (1,035) |  |  |  |  | (1,035)
Balance at end of period (in shares) at Mar. 31, 2018 |  | 223,822 |  |  |  |
Balance at end of period at Mar. 31, 2018 | 1,076,306 | $ 2,823 | 1,053,705 | 65,520 | (30,970) | (14,772)
Balance at beginning of period (in shares) at Dec. 31, 2017 |  | 223,289 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 1,115,901 | $ 2,814 | 1,050,873 | 106,923 | (30,972) | (13,737)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (74,835) |  |  |  |  |
Foreign currency translation adjustments | (653) |  |  |  |  |
Change in marketable securities/ reclassification of marketable securities | 110 |  |  |  |  |
Balance at end of period (in shares) at Sep. 30, 2018 |  | 224,228 |  |  |  |
Balance at end of period at Sep. 30, 2018 | 1,049,183 | $ 2,828 | 1,060,350 | 32,758 | (31,515) | (15,238)
Balance at beginning of period (in shares) at Mar. 31, 2018 |  | 223,822 |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 1,076,306 | $ 2,823 | 1,053,705 | 65,520 | (30,970) | (14,772)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (25,763) |  |  | (25,763) |  |
Foreign currency translation adjustments | (835) |  |  |  | (835) |
Change in marketable securities/ reclassification of marketable securities | 167 |  |  |  | 167 |
Equity-based compensation expense | 2,888 |  | 2,888 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 247 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 2 | (2) |  |  |
Common shares issued for employee stock purchase plan | 1 |  | 1 |  |  |
Treasury shares withheld (in shares) |  | (31) |  |  |  |
Treasury shares withheld | (182) |  |  |  |  | (182)
Balance at end of period (in shares) at Jun. 30, 2018 |  | 224,038 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 1,052,582 | $ 2,825 | 1,056,592 | 39,757 | (31,638) | (14,954)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (6,999) |  |  | (6,999) |  |
Foreign currency translation adjustments | 95 |  |  |  | 95 |
Change in marketable securities/ reclassification of marketable securities | 28 |  |  |  | 28 |
Equity-based compensation expense | 3,008 |  | 3,008 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 90 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 1 | (1) |  |  |
Common shares issued for employee stock purchase plan (in shares) |  | 133 |  |  |  |
Common shares issued for employee stock purchase plan | 753 | $ 2 | 751 |  |  |
Treasury shares withheld (in shares) |  | (33) |  |  |  |
Treasury shares withheld | (284) |  |  |  |  | (284)
Balance at end of period (in shares) at Sep. 30, 2018 |  | 224,228 |  |  |  |
Balance at end of period at Sep. 30, 2018 | 1,049,183 | $ 2,828 | 1,060,350 | 32,758 | (31,515) | (15,238)
Balance at beginning of period (in shares) at Dec. 31, 2018 |  | 224,290 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 1,034,772 | $ 2,829 | 1,062,794 | 16,860 | (32,338) | (15,373)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (28,287) |  |  | (28,287) |  |
Foreign currency translation adjustments | 250 |  |  |  | 250 |
Equity-based compensation expense | 2,574 |  | 2,574 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 720 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 8 | (8) |  |  |
Common shares issued for employee stock purchase plan (in shares) |  | 154 |  |  |  |
Common shares issued for employee stock purchase plan | 692 | $ 2 | 690 |  |  |
Treasury shares withheld (in shares) |  | (220) |  |  |  |
Treasury shares withheld | (1,452) |  |  |  |  | (1,452)
Balance at end of period (in shares) at Mar. 31, 2019 |  | 224,944 |  |  |  |
Balance at end of period at Mar. 31, 2019 | 1,007,849 | $ 2,839 | 1,066,050 | (12,127) | (32,088) | (16,825)
Balance at beginning of period (in shares) at Dec. 31, 2018 |  | 224,290 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 1,034,772 | $ 2,829 | 1,062,794 | 16,860 | (32,338) | (15,373)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (67,236) |  |  |  |  |
Foreign currency translation adjustments | 1,079 |  |  |  |  |
Change in marketable securities/ reclassification of marketable securities | 0 |  |  |  |  |
Balance at end of period (in shares) at Sep. 30, 2019 |  | 225,503 |  |  |  |
Balance at end of period at Sep. 30, 2019 | 976,034 | $ 2,846 | 1,072,768 | (52,712) | (29,623) | (17,245)
Balance at beginning of period (in shares) at Mar. 31, 2019 |  | 224,944 |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 1,007,849 | $ 2,839 | 1,066,050 | (12,127) | (32,088) | (16,825)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (15,160) |  |  | (15,160) |  |
Foreign currency translation adjustments | 458 |  |  |  | 458 |
Change in marketable securities/ reclassification of marketable securities | 0 |  |  | (1,636) | 1,636 |
Equity-based compensation expense | 3,017 |  | 3,017 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 186 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 2 | (2) |  |  |
Treasury shares withheld (in shares) |  | (15) |  |  |  |
Treasury shares withheld | (88) |  |  |  |  | (88)
Balance at end of period (in shares) at Jun. 30, 2019 |  | 225,115 |  |  |  |
Balance at end of period at Jun. 30, 2019 | 996,076 | $ 2,841 | 1,069,065 | (28,923) | (29,994) | (16,913)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (23,789) |  |  | (23,789) |  |
Foreign currency translation adjustments | 371 |  |  |  | 371 |
Change in marketable securities/ reclassification of marketable securities | 0 |  |  |  |  |
Equity-based compensation expense | 2,647 |  | 2,647 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 217 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 2 | (2) |  |  |
Common shares issued for employee stock purchase plan (in shares) |  | 236 |  |  |  |
Common shares issued for employee stock purchase plan | 1,061 | $ 3 | 1,058 |  |  |
Treasury shares withheld (in shares) |  | (65) |  |  |  |
Treasury shares withheld | (332) |  |  |  |  | (332)
Balance at end of period (in shares) at Sep. 30, 2019 |  | 225,503 |  |  |  |
Balance at end of period at Sep. 30, 2019 | $ 976,034 | $ 2,846 | $ 1,072,768 | $ (52,712) | $ (29,623) | $ (17,245)

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