CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
ASSETS    
Cash and cash equivalents $ 22,979 $ 9,307
Short-term investments 4,908 50,523
Accounts receivable:    
Trade, net 17,129 9,743
Other receivables, net 2,787 1,470
Inventory, net 101,898 106,531
Prepaid expenses and other current assets 6,262 18,141
Total current assets 155,963 195,715
Property, plant, equipment, and mineral properties, net 399,144 419,476
Long-term parts inventory, net 20,535 17,344
Long-term investments 0 3,799
Other assets, net 5,885 3,635
Total Assets 581,527 639,969
Accounts payable:    
Trade 11,326 15,709
Related parties 28 45
Accrued liabilities 15,253 15,429
Accrued employee compensation and benefits 4,110 7,409
Current portion of long-term debt, net 14,677 0
Other current liabilities 943 547
Total current liabilities 46,337 39,139
Long-term debt, net 132,024 149,485
Asset retirement obligation 24,274 22,951
Other non-current liabilities 0 1,868
Total Liabilities 202,635 213,443
Common stock, $0.001 par value; 400,000,000 shares authorized; 75,839,998 and 75,702,700 shares outstanding at September 30,2016, and December 31, 2015, respectively 76 76
Additional paid-in capital 582,607 580,227
Accumulated other comprehensive loss 0 (52)
Retained deficit (203,791) (153,725)
Total Stockholders' Equity 378,892 426,526
Total Liabilities and Stockholders' Equity $ 581,527 $ 639,969