Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 138,260	$ 65,626
Short-term investments	62,432	47,379
Accounts receivable, net of allowance for doubtful accounts of $1,181 and $0, respectively	17,010	15,863
Unbilled contract receivable	10,866	51,923
Other current assets	16,949	19,150
Total current assets	245,517	199,941
Property and equipment, net	34,442	38,855
Intangible assets, net	431,789	541,879
Long-term deferred tax assets	5,156	2,742
Goodwill	385,574	382,963
Other assets	7,546	20,056
Total assets	1,110,024	1,186,436
Current liabilities:
Accounts payable	4,233	7,531
Accrued legal fees	7,483	7,505
Accrued liabilities	47,969	29,086
Current portion of long-term debt	34,451	6,000
Deferred revenue	2,686	895
Total current liabilities	96,822	51,017
Long-term deferred tax liabilities	15,085	32,565
Long-term debt, net	545,211	577,239
Other long-term liabilities	17,330	17,830
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock: $0.001 par value; 10,000 shares authorized and no shares issued and outstanding	0	0
Common stock: $0.001 par value; 150,000 shares authorized; 60,608 and 59,596 shares issued, respectively, and 49,103 and 48,854 shares outstanding, respectively	60	59
Additional paid-in capital	686,660	644,194
Treasury stock at cost; 11,505 and 10,742 shares of common stock at each period end, respectively	(319,397)	(300,114)
Accumulated other comprehensive loss	(303)	(148)
Retained earnings	68,556	163,794
Total stockholders’ equity	435,576	507,785
Total liabilities and stockholders’ equity	$ 1,110,024	$ 1,186,436