Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (10,975)	$ (19,319)	$ (17,950)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,971	3,941	8,983
Stock-based compensation	1,433	1,565	2,304
Deferred income taxes	(450)	583	3,698
Other non-cash items	(156)	52	(188)
Changes in assets and liabilities:
Accounts receivable	(10,702)	9,837	(1,380)
Advance billings	(1,626)	3,351	(1,897)
Inventories	(5,317)	(2,503)	2,265
Prepaid expenses and other current assets	(536)	4,616	(3,337)
Other assets	85	252	220
Accounts payable	14,687	(5,312)	(3,906)
Accrued liabilities	(4,554)	(4,553)	3,065
Deferred revenue	1,830	(6,044)	6,268
Other liabilities	(526)	(2,434)	(539)
Net cash provided by (used in) operating activities	(12,836)	(15,968)	(2,394)
Cash flows from investing activities:
Maturities of available-for-sale investments	0	0	2,151
Decrease in restricted cash	(202)	0	2,149
Purchases of property and equipment	(1,171)	(1,487)	(1,928)
Proceeds from Sale of Property, Plant, and Equipment	0	60	842
Net cash provided by (used in) investing activities	(1,373)	(1,427)	3,214
Cash flows from financing activities:
Proceeds from Lines of Credit	28,611	0	0
Repayments of Lines of Credit	(15,000)	0	0
Proceeds from issuance of common stock, net	576	366	12,871
Net cash provided by financing activities	14,187	366	12,871
Effect of exchange rate changes on cash and cash equivalents	246	310	519
Net increase (decrease) in cash and cash equivalents	224	(16,719)	14,210
Cash and cash equivalents, beginning of period	14,354	31,073	16,863
Cash and cash equivalents, end of period	14,578	14,354	31,073
Supplemental Disclosure:
Cash paid for interest	578	0	0
Cash paid for (refunded from) income taxes, net	$ 422	$ 794	$ (479)