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R. SUBSEQUENT EVENTS - NARRATIVE (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 02, 2017 | Mar. 02, 2017 | Feb. 27, 2017 | Jan. 25, 2017 | Oct. 17, 2016 | Jun. 25, 2016 | Jun. 24, 2016 | Mar. 25, 2014 | Mar. 19, 2014 | Oct. 01, 2013 | Aug. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  | $ 5,855,000 | $ 2,413,000 | $ 8,076,000
Repayments of outstanding balance |  |  |  |  |  |  |  |  |  |  |  | 163,068,000 | 121,386,000 | 50,733,000
Common stock, value |  |  |  |  |  |  |  |  |  |  |  | 27,237,000 | 38,648,000 | 45,681,000
Common stock, shares |  |  |  |  |  |  |  | 1,600,000 | 2,000,000 | 3,600,000 |  |  |  |
Proceeds from common stock offering, net |  |  |  |  |  |  |  |  |  |  |  | 27,237,000 | $ 38,648,000 | $ 45,681,000
East West Bank and Comerica Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Term of revolving credit facility |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Interest rate description |  |  |  |  |  | LIBOR | LIBOR |  |  |  |  |  |  |
Subsequent Event [Member] | East West Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of outstanding balance |  |  | $ 9,500,000 |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
ATM Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value |  |  |  |  |  |  |  |  |  |  | $ 38,600,000 |  |  |
Common stock, shares |  |  |  |  | 250,000,000 |  |  |  |  |  | 1,900,000 |  |  |
Weighted average price per share |  |  |  |  |  |  |  |  |  |  | $ 21.54 |  |  |
Proceeds from common stock offering, net |  | $ 48,800,000 |  |  |  |  |  |  |  |  |  |  |  |
ATM Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 459,020 | 1,584,620 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price per share | $ 47.98 | $ 31.55 |  |  |  |  |  |  |  |  |  |  |  |
Second ATM Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares |  |  |  |  | 50,000,000 |  |  |  |  |  |  | 1.10 |  |
Weighted average price per share |  |  |  |  |  |  |  |  |  |  |  | $ 24.85 |  |
Proceeds from common stock offering, net |  |  |  |  |  |  |  |  |  |  |  | 27,200,000 |  |
Purchase and Sale Contract and a Finance Lease Agreement | Subsequent Event [Member] | Chailease Finance Co. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination agreement payment |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | East West Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Term Loan [Member] | East West Bank and Comerica Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Term Loan [Member] | Subsequent Event [Member] | East West Bank and Comerica Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of outstanding balance |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |

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