cash adjustments primarily consisted of foreign exchange rate adjustments and various other immaterial changes of $0.8 million, a change in income tax benefit of $0.4 million, and a change in tax credit schemes accounted for as grants of $0.1 million. The non-cash adjustments were offset by a change in share-based compensation expense of $0.3 million. The positive net cash attributable to changes in our current operating assets (excluding cash) and our current operating liabilities during the period was primarily comprised of an increase of $0.9 million in trade payables and an increase of $0.2 million in other payables, both due to the timing of invoices received, offset by a $0.1 million increase of receivables due to timing of prepayments in our research and development activities.
Net cash used in operating activities was $3.0 million for the three months ended March 31, 2020. The largest component of our cash used in operating activities during this period was a net loss for the period of $3.1 million offset by non-cash charges of $0.5 million and increased by net cash change in our working capital during the period of $0.4 million. The non-cash charges primarily consisted of share-based compensation expense of $0.7 million offset by a change in income tax benefit of $0.2 million. The negative net cash attributable to changes in our current operating assets (excluding cash) and our current operating liabilities during the period was primarily comprised of an increase of $0.1 million in trade payables, offset by a decrease of $0.2 million in other payables, both due to the timing of invoices received, and a $0.3 million increase of receivables due to timing of prepayments in our research and development activities.
Investing Activities
Net cash used in investing activities was primarily driven by the purchase of property, plant and equipment in the amounts of $282,000 and changes in leasehold deposits of $15,000, for the three months ended March 31, 2021. Net cash used in investing activities for the purchase of intangible assets was $60,000 for the three months ended March 31, 2021.
Net cash used in investing activities was primarily driven by the purchase of property, plant and equipment in the amounts of $64,000 and changes in leasehold deposits of $17,000, for the three months ended March 31, 2020.
Financing Activities
Net cash provided by financing activities was $25.3 million for the three months ended March 31, 2021, which was primarily due to net proceeds from the issuance of shares of $27.9 million from our IPO, partially offset by transaction costs of $2.6 million related to the issuance of shares.
Net cash used in financing activities for the three months ended March 31, 2020 was immaterial.
Off-balance Sheet Arrangements
As of March 31, 2021, we did not have any material off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on our financial condition, results of operations, liquidity, capital expenditures or capital resources. We did not have any other off-balance sheet arrangements, as defined in the rules and regulations of the SEC, as of or during the periods presented.
Quantitative and Qualitative Disclosures About Market Risk
Market risk is the risk that the fair value of, or future cash flows from, a financial instrument will vary due to changes in market prices. The type of market risk that primarily impacts us is foreign currency risk.
Foreign Currency Risk
Foreign currency risk is the risk that the fair value or future cash flows of an exposure will fluctuate because of changes in foreign exchange rates. The primary exposure derives from our expenditures in foreign currencies, mainly the USD, the Australian Dollar and the British Pound. This exposure is known as transaction exposure. We are exposed to foreign currency risk as a result of operating transactions and the translation of foreign currency bank accounts and short-term deposits. We seek to minimize our exchange rate risk by maintaining cash positions in the currencies in which we expect to incur the majority of our future expenses and we make payments from those positions.