CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 65,179	$ 42,817
Short-term investments	54,555	79,489
Accounts receivable, net of allowance of $3,093 and $2,422, respectively	30,701	27,094
Prepaid expenses and other current assets	6,497	6,839
Total current assets	156,932	156,239
Property and equipment, net	7,995	8,963
Goodwill	498,277	498,520
Intangible assets, net	153,493	159,811
Other assets	827	858
Total assets	817,524	824,391
Current liabilities:
Accounts payable	3,290	3,884
Accrued expenses and other current liabilities	21,498	19,357
Accrued compensation	13,024	17,089
Total current liabilities	37,812	40,330
Other liabilities	6,154	4,882
Deferred taxes	12,258	12,906
Convertible senior notes, net	210,432	207,370
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value; 100,000,000 shares authorized as of March 31, 2018 and December 31, 2017; 62,280,205 shares and 61,534,101 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	62	61
Additional paid-in capital	882,804	866,330
Accumulated deficit	(335,439)	(311,577)
Accumulated other comprehensive income	3,441	4,089
Total stockholders' equity	550,868	558,903
Total liabilities and stockholders' equity	$ 817,524	$ 824,391