Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (3,652)	$ (4,960)
Depreciation and amortization	12	16
Stock-based compensation	233	466
Benefit of receivable reserves	(11)	(15)
Accumulated effect for accounting changes	605
Changes in operating assets and liabilities:
Accounts receivable	624	(23)
Prepaids and other	(56)	66
Other non-current assets	(8)	(1)
Accounts payable and accrued expenses	(417)	127
Unearned revenue and deferred maintenance	(774)	414
Other noncurrent liabilities	(37)	45
Net cash used for operating activities	(3,481)	(3,865)
Cash flows from investing activities:
Purchase of property and equipment	(2)	(2)
Purchase of short-term investments		(4,493)
Maturities of short-term investments	1,000	8,880
Net cash provided by investing activities	998	4,385
Cash flows from financing activities:
Proceeds from issuance of common stock, net	6	46
Net cash provided by financing activities	6	46
Effect of exchange rates on cash and cash equivalents	77	(333)
Net (decrease) increase in cash and cash equivalents	(2,400)	233
Cash and cash equivalents at beginning of period	8,560	11,730
Cash and cash equivalents at end of period	$ 6,160	$ 11,963