Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 7,036	$ 13,852
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	3,193	3,608
Gain on sale of equipment	(162)
Deferred taxes	465	84
Stock-based compensation expense	3,930	4,467
Provision for doubtful accounts	106
Provision for excess and obsolete inventory	1,142	835
Changes in operating assets & liabilities:
Accounts receivable	(7,898)	3,541
Inventories	(7,534)	(19,096)
Prepaid expenses and other current assets	(58)	(3,637)
Accounts payable and other current liabilities	(4,122)	9,849
Deferred revenue	(704)	2,967
Income taxes	85	73
Other assets and liabilities	(8,494)	(4,120)
Net cash (used in) provided by operating activities	(13,015)	12,423
Cash flows from investing activities
Proceeds from sale of equipment	162
Expenditures for property, plant, and equipment	(2,261)	(1,329)
Net cash used in investing activities	(2,099)	(1,329)
Cash flows from financing activities
Decrease in restricted cash	71	764
Financing fees and other expenses	(146)	(847)
Principal payments on term loan		(14,530)
Principal payments on sale leaseback obligation		(392)
Proceeds from sale leaseback obligation		48,940
Proceeds from exercise of stock options	1,737	3,537
Proceeds from Employee Stock Purchase Plan		213
Net cash provided by financing activities	1,662	37,685
Effect of exchange rate changes on cash and cash equivalents	186	339
Net (decrease) increase in cash and cash equivalents	(13,266)	49,118
Cash and cash equivalents at beginning of period	78,889	30,753
Cash and cash equivalents at end of period	65,623	79,871
Supplemental disclosure of total cash, cash equivalents and restricted cash:
Cash and cash equivalents at end of period	65,623	79,871
Restricted cash at end of period	6,865	61
Total cash, cash equivalents and restricted cash at end of period	$ 72,488	$ 79,932