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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
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Debt Instrument [Line Items] |  |  |  |  |  |
Stated percentage of warrants |  |  |  | 1.625% |  |
1.125% Warrants |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated percentage of warrants | 1.125% | 1.125% | 1.125% | 1.125% | 1.125% |
Convertible Notes | 1.625% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of contractual interest rate |  |  |  | 1.625% |  | 1.625%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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