Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net loss	$ (11,430)	$ (17,758)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	3,441	3,948
Gain on sale of dry strip assets and intellectual property		(1,167)
Deferred taxes	434	272
Stock-based compensation expense	3,779	3,105
Provision for excess and obsolete inventory	590	2,451
Changes in operating assets & liabilities
Accounts receivable	6,164	(4,359)
Inventories	(13,732)	3,455
Prepaid expenses and other current assets	351	(429)
Accounts payable and other current liabilities	(4,849)	6,276
Deferred revenue	372	(2,816)
Income taxes	151	(14)
Other assets and liabilities	976	(3,813)
Net cash used for operating activities	(13,753)	(10,849)
Cash flows from investing activities
Proceeds from sale of dry strip assets and intellectual property		1,200
Expenditures for property, plant, and equipment	(710)	(484)
Increase in restricted cash		(1,477)
Net cash used for investing activities	(710)	(761)
Cash flows from financing activities
Increase in restricted cash		(825)
Financing fees and other expenses		(473)
Proceeds from exercise of stock options	2,058	1,113
Proceeds from Employee Stock Purchase Plan	227	197
Proceeds from issuance of Term Loan		15,000
Principal payments on Term Loan	(185)
Net cash provided by financing activities	2,100	15,012
Effect of exchange rate changes on cash and cash equivalents	(1,391)	(71)
Net (decrease) increase in cash and cash equivalents	(13,754)	3,331
Cash and cash equivalents at beginning of period	46,290	44,986
Cash and cash equivalents at end of period	$ 32,536	$ 48,317