Condensed Balance Sheets - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,767,780	$ 7,507,659
Short-term investments available-for-sale, at fair value	2,610,828	4,304,901
Accounts receivable	1,196,129	1,377,441
Inventory, net of allowance of $274,130 at March 31, 2017 and $270,307 at December 31, 2016	1,255,428	1,511,053
Prepaid expenses and other	368,563	433,328
Total current assets	8,198,728	15,134,382
Deferred offering costs	115,062	49,630
Property and equipment, net	3,083,793	3,270,197
Total assets	11,397,583	18,454,209
Current liabilities:
Accounts payable	1,193,217	761,663
Accrued liabilities	1,281,947	1,670,286
Deferred revenue	255,477	335,659
NuvoGen obligation - current	557,634	604,751
Term loan payable - current	6,527,795	6,389,782
Other current liabilities	241,274	258,850
Total current liabilities	10,057,344	10,020,991
Term loan payable - non-current, net of discount and debt issuance costs	3,827,095	5,389,137
NuvoGen obligation - non-current, net of discount	7,914,597	8,017,356
Other non-current liabilities	560,772	619,587
Total liabilities	22,359,808	24,047,071
Commitments and Contingencies
Stockholders’ deficit:
Common stock, $0.001 par value; 200,000,000 shares authorized at March 31, 2017 and December 31, 2016, 8,060,687 shares issued and outstanding, at March 31, 2017, 7,939,967 and 7,938,571 shares issued and outstanding, respectively, at December 31, 2016	8,059	7,938
Additional paid-in-capital	110,452,770	110,081,334
Treasury stock, 0 shares as of March 31, 2017 and 1,396 shares as of December 31, 2016		(75,000)
Accumulated other comprehensive loss	(736)	(1,090)
Accumulated deficit	(121,422,318)	(115,606,044)
Total stockholders’ deficit	(10,962,225)	(5,592,862)
Total liabilities and stockholders' deficit	$ 11,397,583	$ 18,454,209

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.