CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	[1]
Current assets:
Cash and cash equivalents	$ 15,731	$ 27,598
Short-term investments	38,766	38,136
Accounts receivable, net	10,195	10,019
Prepaid expenses and other current assets	1,352	1,474
Total current assets	66,044	77,227
Property and equipment, net	1,940	1,989
Intangible assets, net	493	1,294
Other assets	988	982
Total assets	69,465	81,492
Current liabilities:
Accounts payable	617	267
Accrued compensation	2,405	2,768
Other accrued liabilities	2,601	4,135
Short-term deferred revenue	2,658	2,184
Total current liabilities	8,281	9,354
Long-term deferred revenue	72	102
Other long-term liabilities	415	690
Total liabilities	8,768	10,146
Commitments and contingencies (Note 4)
Stockholders' equity:
Common stock; par value $0.0001, 150,000,000 shares authorized; 56,762,766 issued and 55,385,052 outstanding at September 30, 2016; 56,152,317 issued and 54,860,883 outstanding at December 31, 2015	6	5
Additional paid-in capital	267,144	265,324
Treasury stock, at cost (1,377,714 shares at September 30, 2016 and 1,291,434 shares at December 31, 2015)	(5,239)	(5,167)
Accumulated other comprehensive loss	(2,233)	(2,302)
Accumulated deficit	(198,981)	(186,514)
Total stockholders' equity	60,697	71,346
Total liabilities and stockholders' equity	$ 69,465	$ 81,492

[1] Derived from the December 31, 2015 audited Consolidated Financial Statements included in our Annual Report on Form 10-K, as filed with the Securities and Exchange Commission ("SEC") on March 7, 2016.