XML 39 R28.htm IDEA: XBRL DOCUMENT v3.19.1
Convertible Senior Notes Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The balance of the Notes at March 31, 2019 is as follows:
Principal amount
$
78,500,000

Unamortized debt discount on the liability component
(16,141,134
)
Unamortized debt issuance cost
(2,221,571
)
Accrued interest
425,208

     Net carrying amount
$
60,562,503