CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	[1]
Current assets:
Cash and cash equivalents	$ 20,993	$ 27,598
Short-term investments	37,025	38,136
Accounts receivable, net	9,439	10,019
Prepaid expenses and other current assets	1,578	1,474
Total current assets	69,035	77,227
Property and equipment, net	2,115	1,989
Intangible assets, net	760	1,294
Other assets	971	982
Total assets	72,881	81,492
Current liabilities:
Accounts payable	1,301	267
Accrued compensation	3,106	2,768
Other accrued liabilities	3,364	4,135
Short-term deferred revenue	2,414	2,184
Total current liabilities	10,185	9,354
Long-term deferred revenue	82	102
Other long-term liabilities	430	690
Total liabilities	10,697	10,146
Commitments and contingencies (Note 4)
Stockholders' equity:
Common stock; par value $0.0001, 150,000,000 shares authorized; 56,618,692 issued and 55,246,262 outstanding at June 30, 2016; 56,152,317 issued and 54,860,883 outstanding at December 31, 2015	6	5
Additional paid-in capital	266,482	265,324
Treasury stock, at cost (1,372,430 shares at June 30, 2016 and 1,291,434 shares at December 31, 2015)	(5,234)	(5,167)
Accumulated other comprehensive loss	(2,218)	(2,302)
Accumulated deficit	(196,852)	(186,514)
Total stockholders' equity	62,184	71,346
Total liabilities and stockholders' equity	$ 72,881	$ 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.