Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 172,018	$ 163,450
Investments in marketable securities	235,339	241,737
Accounts receivable, net	61,271	67,993
Inventories	33,052	31,721
Prepaid expenses and other current assets	9,600	12,208
Total current assets	511,280	517,109
Property and equipment, net	70,740	60,344
Goodwill	104,502	104,502
Identifiable intangible assets, net	180,447	222,933
Other assets, net	22,904	12,618
Total assets	889,873	917,506
Current liabilities:
Accounts payable	15,891	14,721
Deferred revenue	5,432	435
Accrued employee expenses	11,206	15,214
Other accrued expenses	7,595	8,290
Other current liabilities	24,319	21,387
Total current liabilities	64,443	60,047
Convertible debt	447,825	421,431
Other long-term liabilities	10,911	24,627
Total liabilities	523,179	506,105
Commitments and contingencies (Note 17)
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; 44,292,722 and 42,780,229 issued and outstanding at December 31, 2018 and 2017, respectively	44	43
Additional paid-in capital	536,157	484,934
Accumulated deficit	(169,896)	(74,145)
Accumulated other comprehensive income	389	569
Total stockholders’ equity	366,694	411,401
Total liabilities and stockholders’ equity	$ 889,873	$ 917,506