CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 48,219	$ 2,480	$ 14,728
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	25,479	20,088	17,954
Provision (recovery) for doubtful accounts	886	(23)	(143)
Stock-based compensation expense	7,916	9,514	11,513
Non-cash provision for restructuring	1,137	0	0
Non-cash interest expense	9,620	2,890	220
Unrealized foreign currency transaction gains	(2,599)	(7,013)	(6,730)
(Benefit from) provision for deferred taxes	(1,842)	(6,693)	69
Changes in operating assets and liabilities
Accounts receivable	14,321	2,442	2,258
Inventories	(2,628)	3,056	12,122
Prepaid expenses and other current assets	(1,839)	10,000	(2,130)
Accounts payable	(18,959)	11,232	(947)
Accrued expenses, compensation and benefits and other liabilities	(6,280)	(11,842)	(5,758)
Income taxes payable	(9)	(1,041)	(1,090)
Deferred revenues	(122,617)	(69,116)	(51,963)
Net cash used in operating activities	(49,195)	(34,026)	(9,897)
Cash flows from investing activities:
Purchases of property and equipment	(11,003)	(15,330)	(13,292)
Increase in other long-term assets	(30)	(43)	(8)
Payments for business acquisitions, net of cash acquired	0	(65,967)	0
Proceeds from divestiture of consumer business	0	0	1,500
Increase in restricted cash	(4,544)	(456)	0
Net cash used in investing activities	(15,577)	(81,796)	(11,800)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	100,000	120,401	0
Repayment of debt	(3,750)	0	0
Payments for repurchase of common stock	0	(7,999)	0
Cash paid for capped call transaction	0	(10,125)	0
Proceeds from issuance of common stock under employee stock plans	6,184	5,035	252
Common stock repurchases for tax withholdings for net settlement of equity awards	(941)	(1,559)	(688)
Proceeds from revolving credit facilities	25,000	70,500	25,500
Payments on revolving credit facilities	(30,000)	(65,500)	(25,500)
Payments for credit facility issuance costs	(5,041)	(1,195)	0
Net cash provided by (used in) financing activities	91,452	109,558	(436)
Effect of exchange rate changes on cash and cash equivalents	366	(890)	(1,014)
Net increase (decrease) in cash and cash equivalents	27,046	(7,154)	(23,147)
Cash and cash equivalents at beginning of period	17,902	25,056	48,203
Cash and cash equivalents at end of period	44,948	17,902	25,056
Supplemental information: [Abstract]
Cash paid for income taxes, net of refunds	1,587	2,251	2,146
Cash paid for interest	9,302	3,456	1,551
Non-cash transaction - property and equipment included in accounts payable or accruals	119	500	0
Non-cash transaction - unpaid issuance costs for long-term debt	$ 0	$ 130	$ 0