Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 34,673	$ 25,966
Short-term investments	500	7,650
Accounts receivable, net of allowance for doubtful accounts of $2,099 and $1,783 as of December 31, 2018 and 2017, respectively	30,042	29,601
Prepaid taxes	1,834	1,303
Prepaid expenses and other current assets	3,069	3,088
Total current assets	70,118	67,608
Property and equipment, net	10,901	9,786
Long-term investments		496
Goodwill	93,687	93,793
Intangible assets, net	849	506
Deferred tax assets	55	98
Other assets	853	882
Total assets	176,463	173,169
Current liabilities:
Accounts payable	1,871	1,542
Current portion of term loan	1,241	9,888
Accrued expenses and other current liabilities	3,260	3,343
Accrued compensation expenses	2,432	1,397
Income taxes payable	176	218
Contract liabilities	5,573	7,598
Total current liabilities	14,553	23,986
Long-term liabilities:
Long-term portion of term loan	23,714	22,339
Deferred rent	4,949	5,259
Deferred tax liabilities	662	838
Total liabilities	43,878	52,422
Commitments and contingencies (See Note 10)
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value per share, 100,000,000 shares authorized; 54,117,325 shares issued and 27,791,045 shares outstanding at December 31, 2018; 53,338,297 shares issued and 27,483,115 shares outstanding at December 31, 2017	54	53
Treasury stock, 26,326,280 and 25,855,182 shares at December 31, 2018 and 2017, respectively, at cost	(177,905)	(170,816)
Additional paid-in capital	307,014	300,763
Accumulated other comprehensive income (loss)	(215)	65
Retained earnings (accumulated deficit)	3,637	(9,318)
Total stockholders’ equity	132,585	120,747
Total liabilities and stockholders’ equity	$ 176,463	$ 173,169