CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net loss	[1]	$ (1,526)	$ (15,956)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense		430	1,987
Amortization of intangible assets and other		16	1,028
Amortization of premiums and discounts on investments		65	284
Depreciation		628	720
Deferred income taxes		585	17
Loss on disposal of fixed assets		8	124
Changes in operating assets and liabilities:
Accounts receivable, net		(2,384)	452
Prepaid expenses and other current assets		417	264
Other assets		132	(83)
Accounts payable		(581)	818
Accrued compensation		191	(305)
Other accrued liabilities		(1,159)	(1,126)
Other long-term liabilities		(179)	(253)
Deferred revenue		(846)	579
Net cash used in operating activities		(4,203)	(11,450)
Investing activities:
Purchases of property and equipment		(63)	(561)
Purchases of investments		(25,795)	(28,610)
Maturities of investments		31,023	29,993
Net cash provided by investing activities		5,165	822
Financing activities:
Cash settlement in stock split		(1)	0
Proceeds from issuance of common stock		28	86
Repurchase of common stock		(2)	(128)
Net cash provided by (used in) financing activities		25	(42)
Net increase (decrease) in cash and cash equivalents		987	(10,670)
Effect of exchange rate changes on cash and cash equivalents		173	(38)
Cash and cash equivalents at beginning of year		16,890	27,598
Cash and cash equivalents at end of year		18,050	16,890
Supplemental schedule of cash flow information:
Cash paid for income taxes		$ 323	$ 170

[1] Prior periods adjusted to reflect the impact of the one-for-three reverse stock split that became effective on January 20, 2017, as discussed in Note 1.