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Secured Convertible Notes and Related Common Stock Purchase Warrants - Summary of Convertible Notes (Details) $ / shares in Units, $ in Thousands | Sep. 30, 2018 USD ($) $ / shares
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Debt Instrument [Line Items] |
Principal | $ 9,400
Unamortized Discount | (6,600)
Net Amount | 2,800
Accrued Interest | $ 100
June 2018 Convertible Note [Member] |
Debt Instrument [Line Items] |
Interest rate | 8.00%
Conversion price | $ / shares | $ 1.75
Principal | $ 3,400
Unamortized Discount | (1,500)
Net Amount | 1,900
Accrued Interest | $ 100
July 2018 Convertible Note [Member] |
Debt Instrument [Line Items] |
Interest rate | 8.00%
Conversion price | $ / shares | $ 1.75
Principal | $ 2,200
Unamortized Discount | (1,700)
Net Amount | 500
Accrued Interest | $ 10
August 2018 Convertible Note [Member] |
Debt Instrument [Line Items] |
Interest rate | 8.00%
Conversion price | $ / shares | $ 1.75
Principal | $ 3,300
Unamortized Discount | (2,900)
Net Amount | 400
Accrued Interest | $ 10
September 2018 Convertible Note [Member] |
Debt Instrument [Line Items] |
Interest rate | 8.00%
Conversion price | $ / shares | $ 1.75
Principal | $ 500
Unamortized Discount | $ (500)

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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