Unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 217,848,000	$ 172,018,000
Investments in marketable securities	211,006,000	235,339,000
Accounts receivable, net	58,055,000	61,271,000
Inventories	31,739,000	33,052,000
Prepaid expenses and other current assets	10,782,000	9,600,000
Total current assets	529,430,000	511,280,000
Property and equipment, net	68,704,000	70,740,000
Goodwill	104,502,000	104,502,000
Intangible assets, net	164,621,000	180,447,000
Right of use assets, net	9,901,000
Other assets, net	22,250,000	22,904,000
Total assets	899,408,000	889,873,000
Current liabilities:
Accounts payable	13,025,000	15,891,000
Deferred revenue	5,859,000	5,432,000
Accrued employee expenses	8,953,000	11,206,000
Other accrued expenses	7,010,000	7,595,000
Other current liabilities	30,283,000	24,319,000
Total current liabilities	65,130,000	64,443,000
Convertible debt	454,624,000	447,825,000
Other long-term liabilities	16,300,000	10,911,000
Total liabilities	536,054,000	523,179,000
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued
Common stock, $0.001 par value; 500,000,000 shares authorized; 44,660,703 and 44,292,722 issued and outstanding at March 31, 2019 and December 31, 2018, respectively	45,000	44,000
Additional paid-in capital	555,021,000	536,157,000
Accumulated deficit	(192,641,000)	(169,896,000)
Accumulated other comprehensive income	929,000	389,000
Total stockholders’ equity	363,354,000	366,694,000
Total liabilities and stockholders’ equity	$ 899,408,000	$ 889,873,000