CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 394,590	$ 527,266
Short-term investments	0	4,848
Receivables from licensees	21,648	31,183
Notes receivable	63,042	53,613
Inventory, net	18,942	9,147
Prepaid and other current assets	18,995	14,386
Total current assets	517,217	640,443
Property, Plant and Equipment, Net	7,387	7,222
Royalty rights - at fair value	376,510	349,223
Notes and other receivables, long-term	771	17,124
Long-term deferred tax assets	1,539	2,432
Intangible assets, net	51,319	215,823
Other assets	8,993	10,856
Total assets	963,736	1,243,123
Current liabilities:
Accounts payable	13,142	19,785
Accrued liabilities	39,312	45,881
Accrued Income Taxes, Current	16	1,377
Convertible Notes Payable, Current	0	126,066
Total current liabilities	52,470	193,109
Convertible notes payable	124,644	117,415
Contingent consideration	0	42,000
Other long-term liabilities	56,843	44,709
Total liabilities	233,957	397,233
Commitments and Contingencies
Stockholders' equity (deficit):
Preferred stock, par value $0.01 per share, 10,000 shares authorized; no shares issued and outstanding	0	0
Common stock, par value $0.01 per share, 350,000 shares authorized; 136,513 and 153,775 shares issued and outstanding at December 31, 2018 and 2017, respectively	1,365	1,538
Additional paid-in capital	(98,030)	(102,443)
Treasury Stock, Value	(2,103)	0
Accumulated other comprehensive income	0	1,181
Retained earnings	828,547	945,614
Total stockholders' equity	729,779	845,890
Noncontrolling Interest in Variable Interest Entity	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	729,779	845,890
Total liabilities and stockholders' equity	$ 963,736	$ 1,243,123