Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net loss	$ (2,506)	$ (2,637)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	405	486
Amortization	205	434
Loss on disposal of equipment	10	1
Provision for doubtful accounts, net of recoveries	0	(99)
Deferred income taxes	0	(99)
Stock-based compensation, net of forfeitures	(10)	461
Changes in operating assets and liabilities:
Accounts receivable	3,525	(3,331)
Inventories	(26)	219
Prepaid expenses, other current assets and other non-current assets	108	597
Accounts payable	(1,848)	(377)
Accrued liabilities and other non-current liabilities	(1,483)	(1,243)
Net cash used in operating activities	(1,620)	(5,588)
Investing Activities
Purchases of property, equipment and patents	(97)	(91)
Proceeds from the sale of equipment	0	1
Net cash used in investing activities	(97)	(90)
Financing Activities
Change in restricted cash	0	(7,020)
Taxes paid on behalf of equity award participants	(23)	(53)
Net cash used in financing activities	(23)	(7,073)
Effect of exchange rate fluctuations on cash	117	450
Net decrease in cash and cash equivalents	(1,623)	(12,301)
Cash and cash equivalents at beginning of period	11,826	21,684
Cash and cash equivalents at end of period	$ 10,203	$ 9,383