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Fair Value of Financial Instruments - Valuation Assumptions for Warrant Liabilities (Details) - Significant Unobservable Inputs (Level 3) - Valuation Technique, Option Pricing Model | Jun. 30, 2019 $ / shares | Jun. 30, 2018 $ / shares
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Common stock price |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 28.39 | 16.30
Risk free interest rate |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input |  | 0.0260
Risk free interest rate | Minimum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 0.0172 |
Risk free interest rate | Maximum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 0.0195 |
Expected life |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, expected life (in years) |  | 2 years 5 months 27 days
Expected life | Minimum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, expected life (in years) | 11 months 1 day |
Expected life | Maximum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, expected life (in years) | 2 years 9 months 22 days |
Expected volatility |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input |  | 0.327
Expected volatility | Minimum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 0.338 |
Expected volatility | Maximum |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 0.400 |
Dividend yield |  |
Key Inputs and Assumptions, Valuation Techniques |  |
Warrant liability, measurement input | 0.00 | 0.00

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: 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=117815213&loc=d3e19207-110258 + Details
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