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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | IAL | IPI | Common Stock | Common Stock IAL | Common Stock IPI | Treasury Stock | Additional Paid-in Capital | Additional Paid-in Capital IAL | Additional Paid-in Capital IPI | Accumulated Other Comprehensive Income (Loss) | Retained Earnings (Accumulated Deficit) | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ 294,009 |  |  | $ 6 |  |  | $ (17,869) | $ 273,451 |  |  | $ (1,237) | $ 39,300 | $ 358
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (49,130) |  |  |  |  |  |  |  |  |  |  | (49,130) |
Beginning balance (in shares) at Dec. 31, 2015 |  |  |  | 56,220,000 |  |  | 1,785,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 281 |  |  |  |  |  |  |  |  |  | 281 |  |
Sale of common stock, net of issuance cost | 30,090 |  |  |  |  |  |  | 30,090 |  |  |  |  |
Sale of common stock, net of issuance cost (in shares) |  |  |  | 2,450,000 |  |  |  |  |  |  |  |  |
Stock issued under employee stock purchase plan | 833 |  |  |  |  |  |  | 833 |  |  |  |  |
Stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  | (93,000) |  |  |  |  |  |
Common stock issued in payment of accrued liability | 0 |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised | 184 |  |  | $ 0 |  |  |  | 184 |  |  |  |  |
Stock options exercised (in shares) |  |  |  | 114,000 |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  | 653,000 |  |  |  |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  |  |  | 96,000 |  |  |  |  |  |
Treasury stock purchased | $ (2,350) |  |  |  |  |  | $ (2,350) |  |  |  |  |  |
Treasury stock purchased (in shares) | 238,216 |  |  |  |  |  | 238,000 |  |  |  |  |  |
Stock surrendered for exercise of stock options | $ (50) |  |  |  |  |  | $ (50) |  |  |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 3,225 |  |  |  |  |  | 3,000 |  |  |  |  |  |
Excess tax benefit related to share-based awards | $ (2,510) |  |  |  |  |  |  | (2,510) |  |  |  |  |
Stock compensation expense | 13,076 |  |  |  |  |  |  | 13,076 |  |  |  |  |
Stock issued in acquisition |  | $ 3,268 |  |  |  |  |  |  | $ 3,268 |  |  |  |
Stock issued in acquisition (in shares) |  |  |  |  | 248,000 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | 287,701 |  |  | $ 6 |  |  | $ (20,269) | 318,392 |  |  | (956) | (9,830) | 358
Ending balance (in shares) at Dec. 31, 2016 |  |  |  | 59,685,000 |  |  | 2,029,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (27,395) |  |  |  |  |  |  |  |  |  |  | (27,395) |
Foreign currency translation adjustment | 72 |  |  |  |  |  |  |  |  |  | 72 |  |
Stock issued under employee stock purchase plan | 654 |  |  |  |  |  |  | 654 |  |  |  |  |
Stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  | (113,000) |  |  |  |  |  |
Common stock issued in payment of accrued liability | 188 |  |  |  |  |  |  | 188 |  |  |  |  |
Common stock issued in payment of accrued liability (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |  |
Stock options exercised | $ 5,884 |  |  |  |  |  |  | 5,884 |  |  |  |  |
Stock options exercised (in shares) | 663,288 |  |  | 663,000 |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 275,029 |  |  | 275,000 |  |  |  |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  |  |  | 122,000 |  |  |  |  |  |
Treasury stock purchased | $ (1,729) |  |  |  |  |  | $ (1,729) |  |  |  |  |  |
Treasury stock purchased (in shares) | 199,644 |  |  |  |  |  | 200,000 |  |  |  |  |  |
Stock surrendered for exercise of stock options | $ (5,863) |  |  |  |  |  | $ (5,863) |  |  |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 478,287 |  |  |  |  |  | 478,000 |  |  |  |  |  |
Stock compensation expense | $ 10,949 |  |  |  |  |  |  | 10,949 |  |  |  |  |
Stock issued in acquisition |  |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |
Stock issued in acquisition (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |
Repurchase of common stock | (5,203) |  |  |  |  |  | $ (5,203) |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 905,000 |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | 265,258 |  |  | $ 6 |  |  | $ (33,064) | 336,067 |  |  | (884) | (37,225) | 358
Ending balance (in shares) at Dec. 31, 2017 |  |  |  | 60,623,000 |  |  | 3,621,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (70,698) |  |  |  |  |  |  |  |  |  |  | (70,340) | (358)
Foreign currency translation adjustment | (232) |  |  |  |  |  |  |  |  |  | (232) |  |
Stock issued under employee stock purchase plan | 341 |  |  |  |  |  |  | 341 |  |  |  |  |
Stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  | (111,000) |  |  |  |  |  |
Common stock issued in payment of accrued liability | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 1,539,889 |  |  | 1,540,000 |  |  |  |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  |  |  | 158,000 |  |  |  |  |  |
Treasury stock purchased | $ (173) |  |  |  |  |  | $ (173) |  |  |  |  |  |
Treasury stock purchased (in shares) | 102,333 |  |  |  |  |  | 102,000 |  |  |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense | $ 7,128 |  |  |  |  |  |  | 7,128 |  |  |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 201,624 |  |  | $ 6 |  |  | $ (33,237) | $ 343,536 |  |  | $ (1,116) | $ (107,565) | $ 0
Ending balance (in shares) at Dec. 31, 2018 |  |  |  | 62,163,000 |  |  | 3,770,000 |  |  |  |  |  |

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