CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 9,705	$ 26,692
Restricted cash	2,892	0
Accounts receivable, net of allowance for doubtful accounts of $2,636 and $2,185, as of December 31, 2018 and December 31, 2017, respectively	16,120	12,742
Inventories	16,296	16,075
Prepaid expenses and other receivables	3,373	3,622
Total current assets	48,386	59,131
Property, plant and equipment, net	91,775	68,355
Intangible assets, net	48,375	56,017
Goodwill	470	471
Other	1,886	611
Total assets	190,892	184,585
Current liabilities:
Accounts payable	5,933	10,595
Accrued expenses	9,842	8,101
Deferred income, current	2,426	0
Convertible 3.75% Senior Notes, net of debt discount and debt issuance costs (face of $15,702 as of December 31, 2018 )	14,411	0
Total current liabilities	32,612	18,696
Convertible 3.75% Senior Notes, net of debt discount and debt issuance costs (face of $143,750 as of December 31, 2017)	0	120,977
Convertible 4.75% Senior Notes, net of debt discount and debt issuance costs (face of $75,090 as of December 31, 2018)	56,909	0
Revolver, net of debt issuance costs (face of $15,000 as of December 31, 2018)	15,000	0
2023 Term Loan, net of debt issuance costs (face of $70,000 as of December 31, 2018)	67,662	0
Deferred tax liability	215	159
Other long term liabilities	73	0
Total liabilities	172,471	139,832
Commitments and Contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 53,774,221 and 53,400,281 shares issued and outstanding as of December 31, 2018 and December 31, 2017, respectively	557	554
Additional paid-in capital	116,864	106,312
Accumulated deficit	(96,350)	(60,094)
Accumulated other comprehensive loss, net of taxes	(2,650)	(2,019)
Total stockholders’ equity	18,421	44,753
Total liabilities and stockholders’ equity	$ 190,892	$ 184,585