CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash	$ 72,671	$ 46,563
Restricted cash	972	971
Accounts receivable	9,440	5,339
Unbilled receivables	1,357	404
Inventories	9,080	10,344
Prepaid expenses and other current assets	1,584	1,403
Total current assets	95,104	65,024
Inventories, long-term	111	3,155
Property, plant and equipment, net	104,403	104,096
Deferred financing costs, net	1,236	1,154
Other assets	23	23
Total assets	200,877	173,452
Current liabilities:
Accounts payable	2,168	1,663
Accrued and other expenses	5,225	2,430
Deferred revenue	0	1,615
Income taxes payable	7,249	7,058
Current portion of equipment financing obligations	640	674
Current portion of notes payable	278	282
Total current liabilities	15,560	13,722
Equipment financing obligations, net of current portion	502	572
Notes payable, net of current portion	288	288
Deferred tax liabilities, long-term, net	15,368	15,044
Asset retirement obligation	1,404	1,384
Total liabilities	33,122	31,010
Commitments and contingencies (Note 20)
Stockholders’ equity
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,406,068 issued and 40,338,474 outstanding at March 31, 2017; 38,884,068 issued and 38,816,474 outstanding at December 31, 2016	40	39
Treasury stock, at cost, 67,594 shares at March 31, 2017 and December 31, 2016, respectively	(539)	(539)
Additional paid-in capital	157,222	132,879
Retained earnings	11,032	10,063
Total stockholders’ equity	167,755	142,442
Total liabilities and stockholders’ equity	$ 200,877	$ 173,452

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.