Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 9,290	$ 3,753
Accounts receivable, net of allowance of $448 and $448, respectively	8,908	18,146
Derivative instruments	12,860	427
Prepaid expenses and other current assets	4,444	4,438
Total current assets	35,502	26,764
Property and equipment:
Oil and natural gas properties, full cost method of accounting, net	207,966	228,855
Other property and equipment, net	389	421
Total property and equipment, net	208,355	229,276
Right-of-use assets	2,037	1,722
Other assets	5,038	837
Total assets	250,932	258,599
Current liabilities:
Current portion of long-term debt	97,750	115,000
Accounts payable	24,827	24,834
Accrued liabilities and other	10,810	13,972
Revenue payable	10,910	11,442
Derivative instruments	8,630	5,044
Total current liabilities	152,927	170,292
Asset retirement obligations	3,490	3,423
Long-term derivative instruments and other non-current liabilities	14,364	3,762
Long-term deferred revenue and other long-term liabilities	73,655	73,749
Total liabilities	244,436	251,226
Commitments and Contingencies - Note 19
Stockholders’ equity (deficit):
Common stock, $0.0001 par value per share, 150,000,000 shares authorized 95,384,194 and 91,584,460 issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	10	9
Additional paid-in capital	336,236	342,382
Treasury stock, 253,598 shares at cost	(997)	(997)
Accumulated deficit	(581,456)	(579,552)
Total stockholders’ deficit	(246,207)	(238,158)
Total liabilities, mezzanine equity and stockholders’ deficit	250,932	258,599
Series C-1 Preferred Stock
Current liabilities:
Mezzanine equity:	83,379	80,446
Series C-2 Preferred Stock
Current liabilities:
Mezzanine equity:	19,544	18,857
Series D Preferred Stock
Current liabilities:
Mezzanine equity:	29,978	29,082
Series E Preferred Stock
Current liabilities:
Mezzanine equity:	67,609	66,285
Series F Preferred Stock
Current liabilities:
Mezzanine equity:	$ 52,193	$ 50,861