CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 4,121	$ 9,705
Restricted cash	206	2,892
Accounts receivable, net of allowance for doubtful accounts of $0 and $2,636, as of June 30, 2019 and December 31, 2018, respectively	19,409	16,120
Inventories	22,238	16,296
Prepaid expenses and other receivables	2,183	3,373
Total current assets	48,157	48,386
Property, plant and equipment, net	95,753	91,775
Intangible assets, net	46,674	48,375
Goodwill	489	470
Other assets	4,019	1,886
Total assets	195,092	190,892
Current liabilities:
Accounts payable	8,221	5,933
Accrued expenses	7,534	9,842
Deferred income	1,317	2,426
Convertible 3.75% Senior Notes, net of debt discount and debt issuance costs (face of $0 and $15,702 as of June 30, 2019 and December 31, 2018, respectively)	12,491	14,411
Other current liabilities	421	0
Total current liabilities	29,984	32,612
Convertible 4.75% Senior Notes, net of debt discount and debt issuance costs (face of $75,090 as of June 30, 2019 and December 31, 2018, respectively)	58,570	56,909
Revolver, net of debt issuance costs (face of $0 and $15,000 as of June 30, 2019 and December 31, 2018, respectively)	25,000	15,000
2023 Term Loans, net of debt issuance costs (face of $0 and $70,000 as of June 30, 2019 and December 31, 2018, respectively)	72,124	67,662
Deferred tax liability	226	215
Other long term liabilities	2,485	73
Total liabilities	188,389	172,471
Commitments and Contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 100,000,000 shares authorized; 0 and 53,774,221 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	558	557
Additional paid-in capital	117,563	116,864
Accumulated deficit	(109,063)	(96,350)
Accumulated other comprehensive loss	(2,355)	(2,650)
Total stockholders’ equity	6,703	18,421
Total liabilities and stockholders' equity	$ 195,092	$ 190,892