CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents		$ 18,050	$ 16,890
Short-term investments		31,183	36,519
Accounts receivable, less allowance of $9 and $19 at December 31, 2017 and 2016, respectively		11,951	9,567
Prepaid expenses and other current assets		802	1,211
Total current assets		61,986	64,187
Property and equipment, net		1,133	1,706
Intangible assets, net		250	266
Other assets		984	1,070
Total assets		64,353	67,229
Current liabilities:
Accounts payable		504	1,085
Accrued compensation		3,157	2,974
Other accrued liabilities		1,330	2,496
Short-term deferred revenue		2,006	2,759
Total current liabilities		6,997	9,314
Long-term deferred revenue		13	106
Other long-term liabilities		885	501
Total liabilities		7,895	9,921
Commitments and contingencies (Note 5)
Stockholders' equity:
Common stock; par value $0.0001, 50,000,000 shares authorized; 19,211,826 issued and 18,728,912 outstanding at December 31, 2017; 19,030,024 issued and 18,548,180 outstanding at December 31, 2016		2	2
Additional paid-in capital		267,857	267,400
Treasury stock, at cost (482,914 shares at December 31, 2017 and 481,844 shares at December 31, 2016)		(5,297)	(5,295)
Accumulated other comprehensive loss		(2,108)	(2,329)
Accumulated deficit		(203,996)	(202,470)
Total stockholders' equity	[1]	56,458	57,308
Total liabilities and stockholders' equity		$ 64,353	$ 67,229

[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.