Stockholders' equity (deficit) (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule of Company Recognized Stock-Based Compensation Expense

For the three months ended March 31, 2020 and 2019, the Company recognized share-based compensation expense as follows:

	Three Months Ended March 31,
	2020		2019
Cost of services	$	728	$	38
Research and development		13,986		17,127
General and administrative		61,488		76,013
Sales and marketing		3,538		4,855
	$	79,740	$	98,033

Schedule of Warrants to Purchase Shares of Common Stock

At March 31, 2020 and December 31, 2019, the following warrants to purchase shares of common stock were outstanding:

				Outstanding at
Issuance		Exercise Price	Expiration	March 31, 2020	December 31, 2019
January 2010	$	3,955.00	January 2020	—	17
March 2010	$	3,955.00	March 2020	—	7
November 2011	$	3,955.00	November 2021	15	15
December 2011	$	3,955.00	December 2021	2	2
February 2015	$	3,300.00	February 2025	451	451
May 2015	$	3,300.00	May 2020	6,697	6,697
May 2016	$	656.20	May 2021	9,483	9,483
June 2016	$	656.20	May 2021	4,102	4,102
June 2017	$	390.00	June 2022	938	938
July 2017	$	345.00	July 2022	318	318
July 2017	$	250.00	July 2022	2,501	2,501
July 2017	$	212.60	July 2022	50,006	50,006
February 2018	$	81.25	February 2023	9,232	9,232
February 2018	$	65.00	February 2023	92,338	92,338
October 2019	$	2.00	October 2024	629,000	4,700,000
October 2019	$	2.60	October 2024	235,000	235,000
				1,040,083	5,111,107