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Income Taxes - Federal Statutory Income Tax Rate to Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Tax provision (benefit) at federal statutory rate $ (16,027) $ (16,318) $ (13,027)
Permanent differences 1,635 (272) 335
State tax (net of federal benefit) 1,843 1,068 1,170
Foreign rate differential 1,504 287 (838)
Foreign withholding taxes (net of federal) 0 1,229 231
Executive and stock compensation 1,439 1,044 2,701
Adjustment to net operating losses 0 (1,104) 0
Increase (decrease) in valuation allowance 57,830 2,949 (17,520)
Transaction costs 1,189 473 2,106
Tax credits generated/utilized (386) (185) 0
199 Manufacturing deduction 0 0 (594)
Bargain purchase gain 0 0 (496)
Officer life insurance proceeds 0 0 (392)
Foreign E&P 0 0 3,395
Outside basis difference 2,655 0 0
Other (44) (53) 60
Income tax (benefit) expense $ 51,638 $ (10,882) $ (22,869)