CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net loss	$ (36,193)	$ (18,285)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,096	4,380
Write-off and amortization of debt issuance costs	242	837
Share-based compensation expense	676	748
Provision for doubtful accounts	13,794	(2)
Change in fair value of convertible senior notes	1,021
Changes in operating assets and liabilities:
Accounts receivable	34,735	75,108
Inventory	4,435	7,969
Prepaid expenses and other assets	(15,936)	(15,597)
Accounts payable	(9,934)	(19,258)
Accrued expenses	(5,000)	(20,001)
Reserve for sales returns and allowances	(2,279)	(5,873)
Income taxes payable	66
Other liabilities	(111)	(95)
Total adjustments	24,805	28,216
Net cash provided by (used in) operating activities	(11,388)	9,931
Cash flows from investing activities
Purchases of property and equipment	(2,568)	(4,367)
Net cash used in investing activities	(2,568)	(4,367)
Cash flows from financing activities
Repurchase of convertible senior notes		(24,052)
Repayment of credit facility borrowings	(5,000)
Repurchase of common stock for employee tax withholding	(85)	(12)
Net cash used in financing activities	(5,085)	(24,064)
Net decrease in cash and cash equivalents	(19,041)	(18,500)
Effect of foreign currency translation	843	468
Cash and cash equivalents, beginning of period	64,977	86,064
Cash and cash equivalents, end of period	46,779	68,032
Cash paid during the period for:
Income taxes	331	221
Interest	$ 485	$ 2,039