Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net loss	$ (4,977,932)	$ (4,506,180)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	159,863	168,440
Loss on disposal of property and equipment	0	6,068
Noncash interest expense	2,087	1,042
Share-based compensation	245,405	261,497
Changes in operating assets and liabilities:
Accounts receivable	163,174	39,411
Inventory	49,407	(97,849)
Other assets	43,346	199,182
Accounts payable	(215,361)	(80,276)
Accrued compensation and other liabilities	75,683	211,979
Deferred revenue	(6,164)	869
Net cash used in operating activities	(4,460,492)	(3,795,817)
Cash flows from investing activities
Purchases of property and equipment (net of proceeds on disposals)	(27,022)	(1,644)
Net cash used in investing activities	(27,022)	(1,644)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	2,122,861	0
Proceeds from exercise of stock options and warrants	0	9,271
Payments on debt	(25,898)	0
Payments on capital lease obligations	(52,706)	(63,327)
Net cash provided by/(used in) financing activities	2,044,257	(54,056)
Effects of exchange rates on cash	(3,756)	5,254
Net decrease in cash and cash equivalents	(2,447,013)	(3,846,263)
Cash and cash equivalents at beginning of period	4,117,324	7,814,220
Cash and cash equivalents at end of period	1,670,311	3,967,957
Supplemental disclosure of cash flow information
Cash paid for interest	10,702	13,021
Supplemental disclosures of noncash investing and financing activities:
Property and equipment purchased on credit	8,685	27,767
Deferred and accrued financing costs	$ 0	$ 52,210