CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 433,958	$ 423,989
Short-term investments	45,745	54,545
Accounts receivable, net of allowance of $3,577 and $3,382, respectively	50,583	43,571
Prepaid expenses and other current assets	10,503	10,631
Total current assets	540,789	532,736
Property and equipment, net	9,841	10,148
Goodwill	734,459	737,197
Intangible assets, net	238,314	247,394
Operating lease - right-of-use assets	26,850
Other assets	1,372	1,401
Total assets	1,551,625	1,528,876
Current liabilities:
Accounts payable	7,738	7,769
Accrued expenses and other current liabilities	45,733	26,801
Accrued compensation	18,231	27,869
Total current liabilities	71,702	62,439
Other liabilities	4,788	6,191
Operating lease liabilities, net of current portion	22,936
Deferred taxes	29,748	32,444
Convertible senior notes, net	420,893	414,683
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value; 150,000,000 and 100,000,000 shares authorized as of March 31, 2019 and December 31, 2018, respectively; 71,463,411 shares and 70,516,249 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	71	70
Additional paid-in capital	1,457,156	1,434,780
Accumulated deficit	(438,811)	(408,661)
Accumulated other comprehensive (loss) income	(16,858)	(13,070)
Total stockholders' equity	1,001,558	1,013,119
Total liabilities and stockholders' equity	$ 1,551,625	$ 1,528,876