Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 93,841	$ 82,616
Short-term investments	84	84
Accounts receivable, net of allowance for doubtful accounts of $1,532 and $1,754 respectively	37,589	40,183
Prepaid taxes		796
Prepaid expenses and other current assets	4,520	4,084
Total current assets	136,034	127,763
Property and equipment, net	15,191	13,661
Goodwill	179,417	179,118
Intangible assets, net	107,257	108,872
Operating lease assets with right-of-use	25,174	26,031
Deferred tax assets	392	216
Other assets	907	907
Total assets	464,372	456,568
Current liabilities:
Accounts payable	2,583	4,303
Current operating lease liability	3,557	3,611
Accrued expenses and other current liabilities	12,246	16,539
Accrued compensation expenses	2,667	5,789
Income taxes payable	610	487
Contract liabilities	25,061	15,689
Total current liabilities	46,724	46,418
Non-current lease liability	25,992	26,943
Convertible debt	194,976	153,882
Other liabilities	1,221	2,971
Deferred tax liabilities	13,321	23,848
Total liabilities	282,234	254,062
Leases and contingencies (see Note 9)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized; 55,658,260 and 55,633,155 shares issued, respectively; 28,147,418 and 28,122,603 shares outstanding, respectively	56	56
Treasury stock, at cost; 27,510,842 and 27,510,552 shares, respectively	(199,796)	(199,796)
Additional paid-in capital	339,610	363,055
Accumulated other comprehensive income	2,645	1,611
Retained earnings	39,623	37,580
Total stockholders’ equity	182,138	202,506
Total liabilities and stockholders’ equity	$ 464,372	$ 456,568