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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
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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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)
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