Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 11,730	$ 9,600
Short-term investments	7,974	19,531
Accounts receivable, net of reserves of $167 and $135 as of December 31, 2016 and 2015, respectively	896	1,751
Prepaids and other	1,186	1,098
Total current assets	21,786	31,980
Property and equipment, net	60	87
Other assets	147	143
Total assets	21,993	32,210
Current liabilities:
Accounts payable	377	551
Accrued expenses	1,866	2,161
Unearned revenue	1,260	1,518
Deferred maintenance	893	1,553
Total current liabilities	4,396	5,783
Other non-current liabilities	734	918
Total liabilities	5,130	6,701
Commitments and contingencies (Note 6)
Stockholders' equity
Convertible preferred stock, $0.0001 par value; 1,000 shares authorized; none issued and outstanding
Common stock, $0.0001 par value; 11,200 shares authorized; 4,958 and 4,895 shares issued and outstanding as of December 31, 2016 and 2015, respectively
Additional paid-in capital	1,270,649	1,269,582
Accumulated other comprehensive loss	(967)	(739)
Accumulated deficit	(1,252,819)	(1,243,334)
Total stockholders' equity	16,863	25,509
Total liabilities and stockholders' equity	$ 21,993	$ 32,210