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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities:    
Net (loss) income $ (84) $ 4,033
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 5,363 6,152
Amortization of intangible assets 199 430
Asset retirement obligation settlement 0 (1,235)
Gain on disposal of assets 0 (25)
Amortization of deferred financing cost 26 63
Accretion of debt discount 45 145
Deferred income taxes 1,264 318
Stock-based compensation, net 1,025 790
Employee stock purchase plan compensation 13 9
Change in contingent consideration fair value (1,020) (967)
Changes in assets and liabilities:    
Accounts receivable 1,095 (12,445)
Unbilled receivables 4,536 (258)
Inventories 3,642 5,004
Prepaid expenses and other assets (1,933) 1,129
Deferred revenue (2,575) 909
Accounts payable 2,048 (2,501)
Accrued and other expenses (1,471) 4,772
Net cash provided by operating activities 12,061 6,323
Investing activities:    
Purchases of property, plant and equipment (4,185) (8,499)
Net cash used in investing activities (4,185) (8,499)
Financing activities:    
Proceeds from the issuance of notes payable 0 2,021
Repayments of notes payable (1,192) (407)
Payments under equipment financing obligations (32) (22)
Payment of deferred financing and debt issuance costs (20) (830)
Proceeds from revolving credit facility 6,000 13,500
Repayment of revolving credit facility (2,500) (10,500)
Payment of contingent consideration (280) (700)
Proceeds from equity issuance 46 40
Purchase of treasury stock (1,014) (23)
Net cash provided by financing activities 1,008 3,079
Net increase in cash and cash equivalents 8,884 903
Cash and cash equivalents at beginning of year 2,639 1,466
Cash and cash equivalents at end of period 11,523 2,369
Non-cash financing activities:    
Capitalized expenditures in accounts payable and accrued expenses 1,269 2,285
Increase (Decrease) in Income Taxes Payable $ (112) $ 0