CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 15,267	$ 26,692
Accounts receivable, net of allowance for doubtful accounts of $2,787 and $2,185, as of September 30, 2018 and December 31, 2017, respectively	16,707	12,742
Inventories, net	17,882	16,075
Prepaid expenses and other receivables	1,522	3,622
Total current assets	51,378	59,131
Property, plant and equipment, net	88,387	68,355
Intangible assets, net	52,045	56,017
Goodwill	464	471
Other assets	608	611
Total assets	192,882	184,585
Current liabilities:
Accounts payable	4,476	10,595
Accrued expenses	10,437	8,101
2021 Term Loan, net of debt discount and debt issuance costs (face of $25,000 as of September 30, 2018)	24,168	0
Total current liabilities	39,081	18,696
Convertible 3.75% Senior Notes, net of debt discount and debt issuance costs (face of $68,660 and $143,750 as of September 30, 2018 and December 31, 2017, respectively)	61,634	120,977
Convertible 4.75% Senior Notes, net of debt discount and debt issuance costs (face of $75,090 as of September 30, 2018)	56,148	0
Deferred tax liability	249	159
Other long term liabilities	70	0
Total liabilities	157,182	139,832
Commitments and Contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 53,762,888 and 53,400,281 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	557	554
Additional paid-in capital	119,346	106,312
Accumulated deficit	(81,960)	(60,094)
Accumulated other comprehensive loss	(2,243)	(2,019)
Total stockholders’ equity	35,700	44,753
Total liabilities and stockholders' equity	$ 192,882	$ 184,585