Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income (loss)	$ 13,852	$ (11,430)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	3,608	3,441
Deferred taxes	84	434
Stock-based compensation expense	4,467	3,779
Provision for excess and obsolete inventory	835	590
Changes in operating assets & liabilities
Accounts receivable	3,541	6,164
Inventories	(19,096)	(13,732)
Prepaid expenses and other current assets	(3,637)	351
Accounts payable and other current liabilities	9,849	(4,849)
Deferred revenue	2,967	372
Income taxes	73	151
Other assets and liabilities	(4,120)	976
Net cash provided by (used for) operating activities	12,423	(13,753)
Cash flows from investing activities
Expenditures for property, plant and equipment	(1,329)	(710)
Net cash used for investing activities	(1,329)	(710)
Cash flows from financing activities
Decrease in restricted cash	764
Financing fees and other expenses	(847)
Proceeds from exercise of stock options	3,537	2,058
Principal payments on term loan	(14,530)	(185)
Principal payments on sale leaseback obligation	(392)
Proceeds from sale leaseback obligation	48,940
Proceeds from Employee Stock Purchase Plan	213	227
Net cash provided by financing activities	37,685	2,100
Effect of exchange rate changes on cash and cash equivalents	339	(1,391)
Net increase (decrease) in cash and cash equivalents	49,118	(13,754)
Cash and cash equivalents at beginning of period	30,753	46,290
Cash and cash equivalents at end of period	$ 79,871	$ 32,536