CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 208,888	$ 193,822
Restricted cash	8,929
Accounts receivable, less reserve for doubtful accounts of $330 and $227 at June 30, 2019 and December 31, 2018, respectively	43,045	33,015
Royalties and other receivables	44	136
Unbilled receivables	460	2,602
Inventories, net	51,275	42,263
Prepaid expenses and other current assets	3,853	3,901
Total current assets	316,494	275,739
Property, plant and equipment, net	38,125	32,180
Intangible assets, net	220,481	135,438
Goodwill	469,510	326,735
Deferred tax assets	3,917	4,355
Operating lease right of use assets	19,501
Other assets	239	174
Total assets	1,068,267	774,621
Current liabilities:
Accounts payable	11,304	10,489
Operating lease liability	3,287
Accrued liabilities	20,618	15,865
Convertible senior notes, current portion	105,704	103,488
Total current liabilities	140,913	129,842
Deferred tax liabilities	27,690	25,086
Operating lease liability, long-term	20,209
Other liabilities, long-term	487	4,125
Total liabilities	189,299	159,053
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $0.01 par value; 80,000,000 shares authorized; 48,086,422 shares at June 30, 2019 and 43,917,378 shares at December 31, 2018 issued and outstanding	481	439
Additional paid-in capital	892,960	642,590
Accumulated other comprehensive loss	(15,053)	(11,893)
Accumulated earnings (deficit)	580	(15,568)
Total stockholders' equity	878,968	615,568
Total liabilities and stockholders' equity	$ 1,068,267	$ 774,621