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DEBT - Schedule of Debt (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2012
--- | --- | --- | --- | ---
Long-term debt: |  |  |  |
Unamortized discount and debt issuance costs | $ (3,472,000) |  | $ 0 |
Long-term debt, net of unamortized discount and debt issuance costs | $ 65,028,000 |  | 62,709,000 |
4.50% convertible subordinated notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (as a percent) | 4.50% | 4.50% |  | 4.50%
Long-term debt: |  |  |  |
Long-term debt |  |  |  | $ 70,000,000
Convertible subordinated debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
4.50% convertible subordinated notes | $ 63,090,000 |  | 70,000,000 |
Unamortized debt issuance costs | (263,000) |  | (747,000) |
Convertible subordinated debt, net of unamortized debt issuance costs | 62,827,000 |  | 69,253,000 |
Credit agreement with Wells Fargo | Credit agreement with Wells Fargo |  |  |  |
Long-term debt, current: |  |  |  |
Credit agreement with Wells Fargo | 0 |  | 3,000,000 |
Long-term debt: |  |  |  |
Long-term debt | 0 |  | 62,709,000 |
Credit agreement with Wells Fargo | Revolving credit agreement |  |  |  |
Long-term debt: |  |  |  |
Long-term debt | 46,400,000 |  |  |
Credit agreement with Wells Fargo | Revolving credit agreement | Revolving credit agreement |  |  |  |
Long-term debt: |  |  |  |
Long-term debt | 18,500,000 |  | 0 |
Term loan agreement |  |  |  |
Long-term debt: |  |  |  |
Long-term debt | $ 50,000,000 |  | $ 0 |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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