Accrued Liabilities (Tables)

6 Months Ended

Jun. 30, 2019

Accrued liabilities consist of the following:


	June 30, 2019		December 31, 2018
Accrued compensation costs	$	647,984	$	1,585,689
Accrued professional fees		593,616		433,498
Accrued research and development service fees		512,405		2,076,764
Accrued facilities operation expenses		255,836		232,673
Other accrued liabilities		22,775		41,108

Total accrued liabilities	$	2,032,616	$	4,369,732