CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 102,654	$ 110,988
Short-term investments	14,959	13,930
Accounts and other receivables	1,505	1,051
Prepaid expenses and other current assets	8,774	9,856
Total current assets	127,892	135,825
Property and equipment, net	2,144	2,343
Other assets, net	18,445	7,827
Total assets	148,481	145,995
Current liabilities:
Accounts payable	12,375	3,612
Accrued compensation	1,360	3,948
Other current liabilities	6,314	3,194
Deferred revenue	4,816	4,591
Total current liabilities	24,865	15,345
Long-term deferred revenue	29,074	30,203
Other long-term liabilities	3,609	787
Total liabilities	57,548	46,335
Contingencies (Note 12)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 38,375,744 and 37,652,498 shares issued, respectively; 31,552,597 and 30,829,351 shares outstanding, respectively	248,698	246,415
Accumulated other comprehensive income	122	116
Accumulated deficit	(109,537)	(98,521)
Treasury stock at cost: 6,823,147 and 6,823,147 shares, respectively	(48,350)	(48,350)
Total stockholders’ equity	90,933	99,660
Total liabilities and stockholders’ equity	$ 148,481	$ 145,995