CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 30,266	$ 40,562
Accounts receivable, less allowance for doubtful accounts of $93 and $41, respectively	12,587	9,893
Prepaid and other	1,173	671
Current assets of discontinued operations	0	941
Total current assets	44,026	52,067
Property and equipment, net	184	170
Operating lease right-of-use assets	639	0
Deferred tax assets, non-current	620	583
Restricted cash, non-current	377	352
Other assets, non-current	7	7
Total assets	45,853	53,179
Current liabilities:
Accounts payable	983	1,461
Accrued expenses and other current liabilities	7,205	8,984
Operating lease obligations, current	297	0
Current liabilities of discontinued operations	23	115
Total current liabilities	8,508	10,560
Income tax payable, non-current	2,036	1,982
Operating lease obligations, non-current	342	0
Other non-current liabilities	151	150
Total liabilities	11,037	12,692
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value, 10,000 shares authorized; none issued or outstanding	0	0
Common stock, $0.001 par value, 100,000 shares authorized; 36,217 and 36,135 shares issued; 29,389 and 31,905 shares outstanding, respectively	36	36
Additional paid-in capital	485,279	485,095
Accumulated deficit	(437,454)	(435,552)
Accumulated other comprehensive loss, net of applicable tax	(541)	(606)
Treasury stock, 6,828 and 4,230 shares, respectively, at cost	(12,504)	(8,486)
Total stockholders' equity	34,816	40,487
Total liabilities and stockholders' equity	$ 45,853	$ 53,179