Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Grant Date Fair Value
Stock based compensation expenses	$ 1,501,326	$ 1,365,332	$ 3,018,628	$ 1,811,335
Restricted stock awards
Number of Shares
Unvested, Number of Shares	146,800.00		146,800.00		146,800
Weighted Average Grant Date Fair Value
Unvested, Weighted Average Grant-Date Fair Value	$ 5.70		$ 5.70		$ 5.70
Vesting period			20 months
Restricted stock awards - Performance based
Number of Shares
Unvested, Number of Shares	146,800	480,000	146,800	480,000		480,000
Weighted Average Grant Date Fair Value
Unvested, Weighted Average Grant-Date Fair Value		$ 7.27		$ 7.27		$ 7.27