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Convertible Notes Payable - Summary of Notes by Maturity Dates (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 06, 2019
Debt Instrument [Line Items] |  |  |
Interest rate |  |  | 8.00%
Principal | $ 10.5 | $ 4.5 | $ 2.0
Unamortized discount | (0.2) | (2.5) |
Carrying value | $ 10.3 | $ 2.0 |
December 4, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Dec. 04, 2018 | Dec. 04, 2018 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 1.7 |
Carrying value |  | $ 1.7 |
March 1, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Mar. 01, 2019 | Mar. 01, 2019 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 0.6 |
Unamortized discount |  | (0.5) |
Carrying value |  | $ 0.1 |
March 21, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Mar. 21, 2019 | Mar. 21, 2019 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 0.4 |
Unamortized discount |  | (0.2) |
Carrying value |  | $ 0.2 |
December 4, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Dec. 04, 2019 | Dec. 04, 2019 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 0.9 |
Unamortized discount |  | $ (0.9) |
March 1, 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Mar. 01, 2020 | Mar. 01, 2020 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 0.8 |
Unamortized discount |  | $ (0.8) |
March 21, 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Mar. 21, 2020 | Mar. 21, 2020 |
Interest rate |  | 8.00% |
Conversion price |  | $ 1.75 |
Principal |  | $ 0.1 |
Unamortized discount |  | $ (0.1) |

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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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- 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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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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